Editing General Motors transmissions

==Overview==
This article will concern itself with the different types of transmissions used by General Motors, and their physical and mechanical properties.

{{Note1}} Additional info is on the [http://www.crankshaftcoalition.com/wiki/Talk:General_Motors_transmissions '''discussion page'''] that has yet to be incorporated into this page.

==Types of transmissions== 4l60e

==Standard==

==Three speed==

[[Image:64_Nova_3_sp.jpg‎]]
[[Image:64_Nova_3_sp_number.jpg‎]]
[[Image:64_Nova_3_sp._shift_levers.jpg‎]]

From a 1964 Nova 342 Saginaw.

==3-speed manual overdrive units==
===How overdrive works===
The governor powers the solenoid in the mid 20's MPH, you have to let up on the gas pedal to let it shift up. When you push the pedal to the floor the kickdown switch cuts off the power to the solenoid and temporarily cuts off power to the ignition coil so the engine stops running for a second or two. This lets the spring on the solenoid retract and shifts out of overdrive. When you drive less than the governor speed setting in overdrive it cuts off power to the solenoid. 

If you are going up a hill and the car does not coast the solenoid will not retract and you will still be locked in overdrive. When you are in overdrive you can not go backwards. This was called the "hill hold" feature. 

The pull out T-handle is used to lock up the trans into regular 3-speed mode. This is useful when pulling a trailer uphill and important when going down hill. If the handle is pushed in you can coast and not have any engine braking. When you were cruising and in overdrive second gear and some one pulled along side and wanted to race you could stick your toe under the gas pedal and push down on the kick down switch to gear down before hitting the gas and opening all three carbs.

When you wire in a toggle switch to operate the relay to power the solenoid you could shift it into overdrive in any gear and not have to be above the governor speed in first gear. Just like driving a big truck with a two speed rear end. Just remember you have to let up on the gas to let it shift up into overdrive and when you turn off the switch you also have to let up on the gas to let the spring retract the solenoid to shift out of overdrive. If you leave the switch on and are in overdrive you can not shift into reverse and you cannot roll backwards.

===Borg Warner OD wiring diagram===
[[File:Od-wiringdiagrm.jpg]] <br style="clear:both"/>

===Rebuilding the Borg Warner overdrive===
*Article, [http://www.classictruckshop.com/clubs/earlyburbs/projects/t85n/rebuild.htm ''Rebuilding the Borg Warner Overdrive Unit'']

==Four speed manual transmission identification and description== 
 
<gallery widths=230px caption="Three common 4-speed transmissions">
Image:Muncie_M20_4_speed.jpg|'''Muncie M20''' wide ratio‎, the reverse lever is in the extension housing, and the cover has 7 bolts. While looking at the cover, 3rd/4th gear lever is on the left. 1st/2nd gear lever is on the right.
Image:Saginaw2.jpg|The '''Saginaw''' reverse shift lever is on the cover, and the cover has 7 bolts. 
Image:Borgwarner.jpg‎|The '''Borg Warner''' has a 9 bolt cover. 
</gallery>

===T-10 info===
;See [http://www.crankshaftcoalition.com/wiki/Transmission_identification#T-10 T-10 info] at [[Transmission identification]]

===Muncie 4-speed===

====Muncie 4-speed assembly/parts manual====
*[[Media:Munciemanual.pdf|Muncie 4-speed manual transmission assemblies, gears & parts]]

====Identifying Muncie M20 series transmissions====
The external differences between the three Muncie 4 speed transmissions can be deceiving. If the cover is removed, the pitch of the gears can be seen. In order to tell the difference between an M21 and M22 definitively, look at the helix angle on the gearset. M20 and M21 have a steeper pitch, where the M22 will have a less aggressive pitch. M22s are NOT straight-cut or 'spur gears'.

[[File:Muncie gearsM20-21 VS M22.jpg|thumb|400px|left|]] <br style="clear:both"/>

Link to a Muncie page showing [http://www.dandltransmission.com/muncieratio.html Muncie gear ratio, spline counts, exploded view, parts list, etc.] from D&L Transmissions.

====M20 or M21/22?====
Put the transmission in 1st gear. Turn the input 10 times while counting how many times the output turns. If it turns 2.5 times, its an M20 (2.52 1st gear). If it turns 2.2 times, its an M21 or M22 (2.20 1st). 

If you determine it's a close ratio M21 or M22, remove the side cover and look at the angle of the gear teeth (refer to photo above) to see if it's a M22 or not.

====Muncie info from AutoGear:==== 
AutoGear designed the Italian gear program with Antonio Masiero (now Euroricambi). Today there are ways to get over 20 ratios between their M22 and Dragrace M23 programs. AutoGear also makes a 'Muncie Replacement' and replacement parts for GM's Muncie 4-speeds.

To make a strong transmission, use a SuperCase and an Iron Midplate. These 2 things will add a tremendous amount of strength to the transmission. If possible, do not re-use a gearset from the factory case. Factory cases are known to stretch over time and slowly pull the mainshaft gears and countershaft gears out of parallel. This means the gears are 'worn' into each other and will not mesh correctly with new gears or a new case. This leads to a lot of noise and a short lifespan. Use a 26 spline input, hopefully with an oilseal and you could go 27 splines on the mainshaft if its a street car, but it will be stronger with 32 splines on the output.

In most cases there is no sense in using an M21; there are no premium quality gears, and by changing the input and cluster, you get an M20 which has a deeper 1st gear and is better suited to street cars these days. A SuperCase retails for less than $300 and an iron midplate is less than $100. Most shops charge $250 just to repair a used case.

With respect to the M20, M21, and M22; these are technically GM 'RPO' production codes. If you wanted a wide ratio 4-speed it was RPO 'M20' However this code also meant wide a ratio Saginaw or a T10 4-speed, depending on the application and year.

Additionally, M22's are not all 26 spline inputs and 32 spline outputs. The spline count is YEAR specific, not MODEL specific. There are probably more 26 spline input, 32 spline output M20s in the world than any other Muncie 4-speed.

The GM Muncie is stronger than the T10 or ST10. The reason GM went to the T10 '''after''' the Muncie 4-speed was dropped in 1974, is because the T10 is less expensive to produce and the horsepower levels had dropped significantly by then. Some guys do impressive things with the T10; however, Richmond Gear was bought out and at the present time (ca. 2012), the availability of T10 parts is getting worse.

====Muncie reference material==== 
*[http://www.yearone.com/updatedsinglepages/Id_info/muncie.asp Muncie 4-Speed Identification]
*[http://www.nastyz28.com/2gcog/trans.html Camaro Transmission Information and Restoration]
*[http://www.yearone.com/yodnn/tech/VehicleInfoDecoding/GMMuncie4SpeedDecoding/tabid/349/Default.aspx GM Muncie 4-Speed Decoding]
*[http://www.muncie4speed.com/munciecat.pdf 1963-1974 Muncie 4-speed assemblies, gears and parts]
*[http://www.teufert.net/trans/muncie.htm Muncie ID]

===Saginaw 4-speed===
*[http://www.teufert.net/trans/saginaw.htm Saginaw 4-speed ID]

===Borg-Warner 4-speed===
====Borg-Warner reference material==== 
*[http://www.autogear.net/pdfs/T10%20booklet.pdf 1957-1963 Warner T10 4-speed (early) assemblies, gears and parts]
*[http://www.hotrodders.com/forum/attachment.php?attachmentid=47519 T10 manual]

==Five speed==
===GM T-5===
  <table border="1" cellpadding="2" cellspacing="0" height="658" width="863">
    <tr>
      <td bgcolor="#ccccff" height="34" width="10%">
      <p></p><center><b><font color="#000000" face="Arial" size="-1">BW
      Model</font></b></center></td>
      <td bgcolor="#ccccff" height="34" width="21%">
      <p></p><center><b><font color="#000000" face="Arial" size="-1">Original
      application</font></b></center></td>
      <td bgcolor="#ccccff" height="34" width="15%">
      <p></p><center><b><font color="#000000" face="Arial" size="-1">Engine</font></b></center></td>
      <td bgcolor="#ccccff" height="34" width="9%">
      <p></p><center><b><font color="#000000" face="Arial" size="-1">1st
      gear</font></b></center></td>
      <td bgcolor="#ccccff" height="34" width="9%">
      <p></p><center><b><font color="#000000" face="Arial" size="-1">2nd
      gear</font></b></center></td>
      <td bgcolor="#ccccff" height="34" width="8%">
      <p></p><center><b><font color="#000000" face="Arial" size="-1">3rd
      Gear</font></b></center></td>
      <td bgcolor="#ccccff" height="34" width="9%">
      <p></p><center><b><font color="#000000" face="Arial" size="-1">4th
      gear</font></b></center></td>
      <td bgcolor="#ccccff" height="34" width="9%">
      <p></p><center><b><font color="#000000" face="Arial" size="-1">5th
      gear</font></b></center></td>
    </tr>
    <tr>
      <td height="27" width="10%">
      <font color="#000000" face="Arial" size="-1">1352-005</font></td> 
      <td height="27" width="21%">
      <font color="#000000" face="Arial" size="-1">1984-'86 Chevette</font></td> 
      <td height="27" width="15%">
      <font color="#000000" face="Arial" size="-1">1.6 L4</font></td> 
      <td height="27" width="9%">
      <p></p><center><font color="#000000" face="Arial" size="-1">3.76</font></center></td>
      <td height="27" width="9%">
      <p></p><center><font color="#000000" face="Arial" size="-1">2.37</font></center></td>
      <td height="27" width="8%">
      <p></p><center><font color="#000000" face="Arial" size="-1">1.49</font></center></td>
      <td height="27" width="9%">
      <p></p><center><font color="#000000" face="Arial" size="-1">1.00</font></center></td>
      <td height="27" width="9%">
      <p></p><center><font color="#000000" face="Arial" size="-1">0.86</font></center></td>
    </tr>
    <tr>
      <td height="27" width="10%">
      <font color="#000000" face="Arial" size="-1">1352-010</font></td> 
      <td height="27" width="21%">
      <font color="#000000" face="Arial" size="-1">1982 S10</font></td> 
      <td height="27" width="15%">
      <font color="#000000" face="Arial" size="-1">All</font></td> 
      <td height="27" width="9%">
      <p></p><center><font color="#000000" face="Arial" size="-1">4.03</font></center></td>
      <td height="27" width="9%">
      <p></p><center><font color="#000000" face="Arial" size="-1">2.37</font></center></td>
      <td height="27" width="8%">
      <p></p><center><font color="#000000" face="Arial" size="-1">1.49</font></center></td>
      <td height="27" width="9%">
      <p></p><center><font color="#000000" face="Arial" size="-1">1.00</font></center></td>
      <td height="27" width="9%">
      <p></p><center><font color="#000000" face="Arial" size="-1">0.86</font></center></td>
    </tr>
    <tr>
      <td height="27" width="10%">
      <font color="#000000" face="Arial" size="-1">1352-012</font></td> 
      <td height="27" width="21%">
      <font color="#000000" face="Arial" size="-1">1982 S10</font></td> 
      <td height="27" width="15%">
      <font color="#000000" face="Arial" size="-1">2.4 diesel</font></td> 
      <td height="27" width="9%">
      <p></p><center><font color="#000000" face="Arial" size="-1">4.03</font></center></td>
      <td height="27" width="9%">
      <p></p><center><font color="#000000" face="Arial" size="-1">2.37</font></center></td>
      <td height="27" width="8%">
      <p></p><center><font color="#000000" face="Arial" size="-1">1.49</font></center></td>
      <td height="27" width="9%">
      <p></p><center><font color="#000000" face="Arial" size="-1">1.00</font></center></td>
      <td height="27" width="9%">
      <p></p><center><font color="#000000" face="Arial" size="-1">0.86</font></center></td>
    </tr>
    <tr>
      <td bgcolor="#ffffff" height="27" width="10%">
      <font color="#000000" face="Arial" size="-1">1352-013</font></td> 
      <td bgcolor="#ffffff" height="27" width="21%">
      <font color="#000000" face="Arial" size="-1">1983 "T"      truck</font></td> 
      <td bgcolor="#ffffff" height="27" width="15%">
      <font color="#000000" face="Arial" size="-1">4 &amp; 6 cyl</font></td> 
      <td bgcolor="#ffffff" height="27" width="9%">
      <p></p><center><font color="#000000" face="Arial" size="-1">4.03</font></center></td>
      <td bgcolor="#ffffff" height="27" width="9%">
      <p></p><center><font color="#000000" face="Arial" size="-1">2.37</font></center></td>
      <td bgcolor="#ffffff" height="27" width="8%">
      <p></p><center><font color="#000000" face="Arial" size="-1">1.49</font></center></td>
      <td bgcolor="#ffffff" height="27" width="9%">
      <p></p><center><font color="#000000" face="Arial" size="-1">1.00</font></center></td>
      <td bgcolor="#ffffff" height="27" width="9%">
      <p></p><center><font color="#000000" face="Arial" size="-1">0.86</font></center></td>
    </tr>
    <tr>
      <td bgcolor="#ffffff" height="27" width="10%">
      <font color="#000000" face="Arial" size="-1">1352-014</font></td> 
      <td bgcolor="#ffffff" height="27" width="21%">
      <font color="#000000" face="Arial" size="-1">1983 "T"      truck</font></td> 
      <td bgcolor="#ffffff" height="27" width="15%">
      <font color="#000000" face="Arial" size="-1">4 cyl all</font></td> 
      <td bgcolor="#ffffff" height="27" width="9%">
      <p></p><center><font color="#000000" face="Arial" size="-1">4.03</font></center></td>
      <td bgcolor="#ffffff" height="27" width="9%">
      <p></p><center><font color="#000000" face="Arial" size="-1">2.37</font></center></td>
      <td bgcolor="#ffffff" height="27" width="8%">
      <p></p><center><font color="#000000" face="Arial" size="-1">1.49</font></center></td>
      <td bgcolor="#ffffff" height="27" width="9%">
      <p></p><center><font color="#000000" face="Arial" size="-1">1.00</font></center></td>
      <td bgcolor="#ffffff" height="27" width="9%">
      <p></p><center><font color="#000000" face="Arial" size="-1">0.86</font></center></td>
    </tr>
    <tr>
      <td height="27" width="10%">
      <font color="#000000" face="Arial" size="-1">1352-033</font></td> 
      <td height="27" width="21%">
      <font color="#000000" face="Arial" size="-1">1983 S10</font></td> 
      <td height="27" width="15%">
      <font color="#000000" face="Arial" size="-1">2.0 L4, 2.8 V6</font></td> 
      <td height="27" width="9%">
      <p></p><center><font color="#000000" face="Arial" size="-1">4.03</font></center></td>
      <td height="27" width="9%">
      <p></p><center><font color="#000000" face="Arial" size="-1">2.37</font></center></td>
      <td height="27" width="8%">
      <p></p><center><font color="#000000" face="Arial" size="-1">1.49</font></center></td>
      <td height="27" width="9%">
      <p></p><center><font color="#000000" face="Arial" size="-1">1.00</font></center></td>
      <td height="27" width="9%">
      <p></p><center><font color="#000000" face="Arial" size="-1">0.86</font></center></td>
    </tr>
    <tr>
      <td height="27" width="10%">
      <font color="#000000" face="Arial" size="-1">1352-042</font></td> 
      <td height="27" width="21%">
      <font color="#000000" face="Arial" size="-1">1984-'85 S10</font></td> 
      <td height="27" width="15%">
      <font color="#000000" face="Arial" size="-1">2.8 V6</font></td> 
      <td height="27" width="9%">
      <p></p><center><font color="#000000" face="Arial" size="-1">4.03</font></center></td>
      <td height="27" width="9%">
      <p></p><center><font color="#000000" face="Arial" size="-1">2.37</font></center></td>
      <td height="27" width="8%">
      <p></p><center><font color="#000000" face="Arial" size="-1">1.49</font></center></td>
      <td height="27" width="9%">
      <p></p><center><font color="#000000" face="Arial" size="-1">1.00</font></center></td>
      <td height="27" width="9%">
      <p></p><center><font color="#000000" face="Arial" size="-1">0.76</font></center></td>
    </tr>
    <tr>
      <td bgcolor="#ffffff" height="27" width="10%">
      <font color="#000000" face="Arial" size="-1">1352-043</font></td> 
      <td bgcolor="#ffffff" height="27" width="21%">
      <font color="#000000" face="Arial" size="-1">1984-'85 S10</font></td> 
      <td bgcolor="#ffffff" height="27" width="15%">
      <font color="#000000" face="Arial" size="-1">2.8 V6</font></td> 
      <td bgcolor="#ffffff" height="27" width="9%">
      <p></p><center><font color="#000000" face="Arial" size="-1">4.03</font></center></td>
      <td bgcolor="#ffffff" height="27" width="9%">
      <p></p><center><font color="#000000" face="Arial" size="-1">2.37</font></center></td>
      <td bgcolor="#ffffff" height="27" width="8%">
      <p></p><center><font color="#000000" face="Arial" size="-1">1.49</font></center></td>
      <td bgcolor="#ffffff" height="27" width="9%">
      <p></p><center><font color="#000000" face="Arial" size="-1">1.00</font></center></td>
      <td bgcolor="#ffffff" height="27" width="9%">
      <p></p><center><font color="#000000" face="Arial" size="-1">0.76</font></center></td>
    </tr>
    <tr>
      <td height="27" width="10%">
      <font color="#000000" face="Arial" size="-1">1352-055</font></td> 
      <td height="27" width="21%">
      <font color="#000000" face="Arial" size="-1">1984 S10</font></td> 
      <td height="27" width="15%">
      <font color="#000000" face="Arial" size="-1">1.9 L4 Isuzu</font></td> 
      <td height="27" width="9%">
      <p></p><center><font color="#000000" face="Arial" size="-1">4.03</font></center></td>
      <td height="27" width="9%">
      <p></p><center><font color="#000000" face="Arial" size="-1">2.37</font></center></td>
      <td height="27" width="8%">
      <p></p><center><font color="#000000" face="Arial" size="-1">1.49</font></center></td>
      <td height="27" width="9%">
      <p></p><center><font color="#000000" face="Arial" size="-1">1.00</font></center></td>
      <td height="27" width="9%">
      <p></p><center><font color="#000000" face="Arial" size="-1">0.86</font></center></td>
    </tr>
    <tr>
      <td bgcolor="#ffffff" height="27" width="10%">
      <font color="#000000" face="Arial" size="-1">1352-056</font></td> 
      <td bgcolor="#ffffff" height="27" width="21%">
      <font color="#000000" face="Arial" size="-1">1984 S10</font></td> 
      <td bgcolor="#ffffff" height="27" width="15%">
      <font color="#000000" face="Arial" size="-1">2.0 L4</font></td> 
      <td bgcolor="#ffffff" height="27" width="9%">
      <p></p><center><font color="#000000" face="Arial" size="-1">4.03</font></center></td>
      <td bgcolor="#ffffff" height="27" width="9%">
      <p></p><center><font color="#000000" face="Arial" size="-1">2.37</font></center></td>
      <td bgcolor="#ffffff" height="27" width="8%">
      <p></p><center><font color="#000000" face="Arial" size="-1">1.49</font></center></td>
      <td bgcolor="#ffffff" height="27" width="9%">
      <p></p><center><font color="#000000" face="Arial" size="-1">1.00</font></center></td>
      <td bgcolor="#ffffff" height="27" width="9%">
      <p></p><center><font color="#000000" face="Arial" size="-1">0.86</font></center></td>
    </tr>
    <tr>
      <td bgcolor="#ffffff" height="27" width="10%">
      <font color="#000000" face="Arial" size="-1">1352-057</font></td> 
      <td bgcolor="#ffffff" height="27" width="21%">
      <font color="#000000" face="Arial" size="-1">1984 S10</font></td> 
      <td bgcolor="#ffffff" height="27" width="15%">
      <font color="#000000" face="Arial" size="-1">1.9 L4 Isuzu</font></td> 
      <td bgcolor="#ffffff" height="27" width="9%">
      <p></p><center><font color="#000000" face="Arial" size="-1">4.03</font></center></td>
      <td bgcolor="#ffffff" height="27" width="9%">
      <p></p><center><font color="#000000" face="Arial" size="-1">2.37</font></center></td>
      <td bgcolor="#ffffff" height="27" width="8%">
      <p></p><center><font color="#000000" face="Arial" size="-1">1.49</font></center></td>
      <td bgcolor="#ffffff" height="27" width="9%">
      <p></p><center><font color="#000000" face="Arial" size="-1">1.00</font></center></td>
      <td bgcolor="#ffffff" height="27" width="9%">
      <p></p><center><font color="#000000" face="Arial" size="-1">0.86</font></center></td>
    </tr>
    <tr>
      <td height="27" width="10%">
      <font color="#000000" face="Arial" size="-1">1352-058</font></td> 
      <td height="27" width="21%">
      <font color="#000000" face="Arial" size="-1">1984 S10</font></td> 
      <td height="27" width="15%">
      <font color="#000000" face="Arial" size="-1">2.0 L4, 2.8 V6</font></td> 
      <td height="27" width="9%">
      <p></p><center><font color="#000000" face="Arial" size="-1">4.03</font></center></td>
      <td height="27" width="9%">
      <p></p><center><font color="#000000" face="Arial" size="-1">2.37</font></center></td>
      <td height="27" width="8%">
      <p></p><center><font color="#000000" face="Arial" size="-1">1.49</font></center></td>
      <td height="27" width="9%">
      <p></p><center><font color="#000000" face="Arial" size="-1">1.00</font></center></td>
      <td height="27" width="9%">
      <p></p><center><font color="#000000" face="Arial" size="-1">0.86</font></center></td>
    </tr>
    <tr>
      <td height="27" width="10%">
      <font color="#000000" face="Arial" size="-1">1352-101</font></td> 
      <td height="27" width="21%">
      <font color="#000000" face="Arial" size="-1">1985 Minivan</font></td> 
      <td height="27" width="15%">
      <font color="#000000" face="Arial" size="-1">4.3 V6</font></td> 
      <td height="27" width="9%">
      <p></p><center><font color="#000000" face="Arial" size="-1">3.50</font></center></td>
      <td height="27" width="9%">
      <p></p><center><font color="#000000" face="Arial" size="-1">2.14</font></center></td>
      <td height="27" width="8%">
      <p></p><center><font color="#000000" face="Arial" size="-1">1.39</font></center></td>
      <td height="27" width="9%">
      <p></p><center><font color="#000000" face="Arial" size="-1">1.00</font></center></td>
      <td height="27" width="9%">
      <p></p><center><font color="#000000" face="Arial" size="-1">0.73</font></center></td>
    </tr>
    <tr>
      <td height="27" width="10%">
      <font color="#000000" face="Arial" size="-1">1352-102</font></td> 
      <td height="27" width="21%">
      <font color="#000000" face="Arial" size="-1">1985-'86 Minivan</font></td> 
      <td height="27" width="15%">
      <font color="#000000" face="Arial" size="-1">2.5 L4, 2.8 V6</font></td> 
      <td height="27" width="9%">
      <p></p><center><font color="#000000" face="Arial" size="-1">3.76</font></center></td>
      <td height="27" width="9%">
      <p></p><center><font color="#000000" face="Arial" size="-1">2.18</font></center></td>
      <td height="27" width="8%">
      <p></p><center><font color="#000000" face="Arial" size="-1">1.42</font></center></td>
      <td height="27" width="9%">
      <p></p><center><font color="#000000" face="Arial" size="-1">1.00</font></center></td>
      <td height="27" width="9%">
      <p></p><center><font color="#000000" face="Arial" size="-1">0.72</font></center></td>
    </tr>
    <tr>
      <td height="27" width="10%">
      <font color="#000000" face="Arial" size="-1">1352-107</font></td> 
      <td height="27" width="21%">
      <font color="#000000" face="Arial" size="-1">1985 S10</font></td> 
      <td height="27" width="15%">
      <font color="#000000" face="Arial" size="-1">2.2 L4 diesel</font></td> 
      <td height="27" width="9%">
      <p></p><center><font color="#000000" face="Arial" size="-1">3.76</font></center></td>
      <td height="27" width="9%">
      <p></p><center><font color="#000000" face="Arial" size="-1">2.18</font></center></td>
      <td height="27" width="8%">
      <p></p><center><font color="#000000" face="Arial" size="-1">1.42</font></center></td>
      <td height="27" width="9%">
      <p></p><center><font color="#000000" face="Arial" size="-1">1.00</font></center></td>
      <td height="27" width="9%">
      <p></p><center><font color="#000000" face="Arial" size="-1">0.72</font></center></td>
    </tr>
    <tr>
      <td bgcolor="#ffffff" height="27" width="10%">
      <font color="#000000" face="Arial" size="-1">1352-108</font></td> 
      <td bgcolor="#ffffff" height="27" width="21%">
      <font color="#000000" face="Arial" size="-1">1985-'86 S10</font></td> 
      <td bgcolor="#ffffff" height="27" width="15%">
      <font color="#000000" face="Arial" size="-1">2.5 L4, 2.8 V6</font></td> 
      <td bgcolor="#ffffff" height="27" width="9%">
      <p></p><center><font color="#000000" face="Arial" size="-1">3.76</font></center></td>
      <td bgcolor="#ffffff" height="27" width="9%">
      <p></p><center><font color="#000000" face="Arial" size="-1">2.18</font></center></td>
      <td bgcolor="#ffffff" height="27" width="8%">
      <p></p><center><font color="#000000" face="Arial" size="-1">1.42</font></center></td>
      <td bgcolor="#ffffff" height="27" width="9%">
      <p></p><center><font color="#000000" face="Arial" size="-1">1.00</font></center></td>
      <td bgcolor="#ffffff" height="27" width="9%">
      <p></p><center><font color="#000000" face="Arial" size="-1">0.72</font></center></td>
    </tr>
    <tr>
      <td height="27" width="10%">
      <font color="#000000" face="Arial" size="-1">1352-110</font></td> 
      <td height="27" width="21%">
      <font color="#000000" face="Arial" size="-1">1985 S10</font></td> 
      <td height="27" width="15%">
      <font color="#000000" face="Arial" size="-1">2.5 L4, 2.8 V6</font></td> 
      <td height="27" width="9%">
      <p></p><center><font color="#000000" face="Arial" size="-1">3.76</font></center></td>
      <td height="27" width="9%">
      <p></p><center><font color="#000000" face="Arial" size="-1">2.18</font></center></td>
      <td height="27" width="8%">
      <p></p><center><font color="#000000" face="Arial" size="-1">1.42</font></center></td>
      <td height="27" width="9%">
      <p></p><center><font color="#000000" face="Arial" size="-1">1.00</font></center></td>
      <td height="27" width="9%">
      <p></p><center><font color="#000000" face="Arial" size="-1">0.72</font></center></td>
    </tr>
    <tr>
      <td height="27" width="10%">
      <font color="#000000" face="Arial" size="-1">1352-136</font></td> 
      <td height="27" width="21%">
      <font color="#000000" face="Arial" size="-1">1985 S10</font></td> 
      <td height="27" width="15%">
      <font color="#000000" face="Arial" size="-1">2.2 L4 diesel</font></td> 
      <td height="27" width="9%">
      <p></p><center><font color="#000000" face="Arial" size="-1">3.76</font></center></td>
      <td height="27" width="9%">
      <p></p><center><font color="#000000" face="Arial" size="-1">2.18</font></center></td>
      <td height="27" width="8%">
      <p></p><center><font color="#000000" face="Arial" size="-1">1.42</font></center></td>
      <td height="27" width="9%">
      <p></p><center><font color="#000000" face="Arial" size="-1">1.00</font></center></td>
      <td height="27" width="9%">
      <p></p><center><font color="#000000" face="Arial" size="-1">0.72</font></center></td>
    </tr>
    <tr>
      <td height="27" width="10%">
      <font color="#000000" face="Arial" size="-1">1352-145</font></td> 
      <td height="27" width="21%">
      <font color="#000000" face="Arial" size="-1">1985-'86 S10</font></td> 
      <td height="27" width="15%">
      <font color="#000000" face="Arial" size="-1">2.5 L4, 2.8 V6</font></td> 
      <td height="27" width="9%">
      <p></p><center><font color="#000000" face="Arial" size="-1">3.76</font></center></td>
      <td height="27" width="9%">
      <p></p><center><font color="#000000" face="Arial" size="-1">2.18</font></center></td>
      <td height="27" width="8%">
      <p></p><center><font color="#000000" face="Arial" size="-1">1.42</font></center></td>
      <td height="27" width="9%">
      <p></p><center><font color="#000000" face="Arial" size="-1">1.00</font></center></td>
      <td height="27" width="9%">
      <p></p><center><font color="#000000" face="Arial" size="-1">0.72</font></center></td>
    </tr>
    <tr>
      <td height="27" width="10%">
      <font color="#000000" face="Arial" size="-1">1352-146</font></td> 
      <td height="27" width="21%">
      <font color="#000000" face="Arial" size="-1">1985 S10</font></td> 
      <td height="27" width="15%">
      <font color="#000000" face="Arial" size="-1">2.8 V6</font></td> 
      <td height="27" width="9%">
      <p></p><center><font color="#000000" face="Arial" size="-1">4.03</font></center></td>
      <td height="27" width="9%">
      <p></p><center><font color="#000000" face="Arial" size="-1">2.37</font></center></td>
      <td height="27" width="8%">
      <p></p><center><font color="#000000" face="Arial" size="-1">1.49</font></center></td>
      <td height="27" width="9%">
      <p></p><center><font color="#000000" face="Arial" size="-1">1.00</font></center></td>
      <td height="27" width="9%">
      <p></p><center><font color="#000000" face="Arial" size="-1">0.76</font></center></td>
    </tr>
    <tr>
      <td height="27" width="10%">
      <font color="#000000" face="Arial" size="-1">1352-148</font></td> 
      <td height="27" width="21%">
      <font color="#000000" face="Arial" size="-1">1985 Minivan</font></td> 
      <td height="27" width="15%">
      <font color="#000000" face="Arial" size="-1">4.3 V6</font></td> 
      <td height="27" width="9%">
      <p></p><center><font color="#000000" face="Arial" size="-1">3.50</font></center></td>
      <td height="27" width="9%">
      <p></p><center><font color="#000000" face="Arial" size="-1">2.14</font></center></td>
      <td height="27" width="8%">
      <p></p><center><font color="#000000" face="Arial" size="-1">1.39</font></center></td>
      <td height="27" width="9%">
      <p></p><center><font color="#000000" face="Arial" size="-1">1.00</font></center></td>
      <td height="27" width="9%">
      <p></p><center><font color="#000000" face="Arial" size="-1">0.73</font></center></td>
    </tr>
    <tr>
      <td height="27" width="10%">
      <font color="#000000" face="Arial" size="-1">1352-149</font></td> 
      <td height="27" width="21%">
      <font color="#000000" face="Arial" size="-1">1986 Minivan</font></td> 
      <td height="27" width="15%">
      <font color="#000000" face="Arial" size="-1">4.3 V6</font></td> 
      <td height="27" width="9%">
      <p></p><center><font color="#000000" face="Arial" size="-1">3.50</font></center></td>
      <td height="27" width="9%">
      <p></p><center><font color="#000000" face="Arial" size="-1">2.14</font></center></td>
      <td height="27" width="8%">
      <p></p><center><font color="#000000" face="Arial" size="-1">1.39</font></center></td>
      <td height="27" width="9%">
      <p></p><center><font color="#000000" face="Arial" size="-1">1.00</font></center></td>
      <td height="27" width="9%">
      <p></p><center><font color="#000000" face="Arial" size="-1">0.73</font></center></td></tr>
</table><br>

===T-5 info and resources===
*[http://www.autogear.net/AftermarketHome1.html AGE] OE parts for Tremec T45/T5 transmissions
*[http://www.inliners.org/Jack/t5_page.html Inliners tech web page for T5 transmissions] 
*[http://www.moderndriveline.com/ Modern Driveline's home page with T5 tech links] 
*[http://www.stovebolt.com/techtips/t5tranny.htm Stovebolt.com's web page for T5 transmissions] 
*[http://www.garage-scene.com/t5-into-ag-body/ Garage Scene web page] great T5 identification information 
*[http://www.fordmuscle.com/archives/2000/09/t5swap/index.php Ford Muscle's T5 web page] 
*[http://pomoforacing.com/tech/T5Rebuild2002.pdf PoMoFoRacing tech web page link on rebuilding a T5 transmission] 
*[http://www.5speeds.com/t5/index.html 5speeds.com index]
*[http://www.moderndriveline.com/Technical_Bits/t5_history.htm Modern Driveline T5 info]
*[http://www.ddperformance.com D&D Performance]
*[http://www.hanlonmotorsports.com Hanlon Motorsports]
*[http://www.nationaldrivetrain.com National Drivetrain]
*[http://www.ttcautomotive.com/onlineorder/product.asp TTC (Tremec)]
*[http://www.jalopyjournal.com/forum/showthread.php?t=169265 HAMB links]
*[http://www.flatheadv8.org/t5-swap.htm T5 swap info] from flathead V8.org
*[http://www.flatheadv8.org/ernie/ernie-t5.htm] also from flathead V8.org 
*[http://www.hotrodders.com/forum/t5-trans-question-172815-2.html Hotrodders thread] 
*[http://www.hemmings.com/mus/stories/2004/07/01/hmn_feature25.html Hemmings info]
*[http://www.carcraft.com/techarticles/ccrp_1206_600_dollar_five_speed_swap/index.html The $600 Five-Speed Swap], Car Craft, June, 2012
*[http://www.crankshaftcoalition.com/wiki/Transmission_identification#Ford_T-5 Ford T-5] CC wiki page

===NV3500===
* 1988–1998 Chevrolet & GMC CK with 4.3 liter V6 and 5.0 liter V8 and 5.7 liter V8
* 1999–2006 [[Chevrolet Silverado]] 1500 and 2500LD
* 1999–2006 [[GMC Sierra]] 1500 and 2500LD 
* 1993–2003 GM S (S10 etc.) trucks with 4.3 liter V6
* 1994–2001 [[Dodge Ram]] 1500
* 1994–1995 [[Dodge Ram]] 2500 Light Duty
* 1994-2004 [[Dodge Dakota]]

'''Wide Ratio Gearing Option in Dodge 1500 & GM Full-size Light Trucks:'''
{| class=wikitable
!1
!2
!3
!4
!5
!R
|-
|4.02
|2.32
|1.40
|1.00
|0.73
|3.55
|}

'''Close Ratio GM S/T Small Trucks & 2500 Light Duty Dodge Ram Truck Gearing:'''
{| class=wikitable
!1
!2
!3
!4
!5
!R
|-
|3.49
|2.16
|1.40
|1.00
|0.73
|3.55
|}

==Six speed manual==
GM used three basic 6 speed manuals over the years: 
*ZF S6-40
*Borg Warner/Tremec T56
*New Process/New Venture NV5600 in trucks

===German ZF S6-40===
Starting with the 1988-'96 Corvette, a German ZF 6-speed was used, designated S6-40.  It was stout and reliable, but its limited use and short production run didn't give rise to wide aftermarket support. In fact GM didn't even stock service parts for the transmissions, instead opting to provide remanufactured units instead of repairing them.  Although it ended up costing GM less in the long run, it was a concept not warmly received by the public.  Early models were rated for 400 ft/lbs, and later models were rated to 450 ft/lbs.  

ZF 6-speed ratios are as follows:
*Reverse - 2.50
*First - 2.68
*Second - 1.80
*Third - 1.29
*Fourth - 1.00
*Fifth - 0.75
*Sixth - 0.50

[[File:CutawayZF S6 40.jpg|thumb|left|300px|ZF S6-40 transmission]]
<br style="clear:both"/>

===Borg Warner/Tremec T56===
Starting with the 1992/1993 GM F-body (Camaro, Firebird, Trans Am) the six speed was a Borg Warner-designed, Tremec-built T56 transmission. Although the basic design, case, and internal operation were the same, three different ratio gear sets were available in GM applications. In 1993, F-body cars were equipped with two optional rear axle ratios: 2.73 and 3.23. Beginning in 1994, all T56 cars used the same ratio gear set regardless of rear axle ratio. 1992-1993 T56s with the lower gear sets had a slightly lower torque capacity in the 350 lb-ft range while 1994-later (high) gear sets reduced the side loads on the case and were rated to 450 lb-ft. T56 use continued like this until 1997 when it also started being used in the Y-body (Corvette) as a rear-mounted transaxle, and continued on in F-bodies behind the LS1 until the end of their production.

Of note is the fact that all T56 transmissions share an interchangeable main case; even those found in Holdens, Fords, Vipers, and Aston Martins. What differs is the front adapter plate, tail shaft housing, shifter, and input/output shafts. Internally, there were some interchangeable differences, like the type of shift forks and synchronizers used, but for the most part all T56s are built on the same stout center section. 

====T56 general info====
{| class=wikitable
!Tag ID
!Application
!Torque Rating
!1st
!2nd
!3rd
!4th
!5th
!6th
!Rev
!Input Splines
!Output Splines
|-
|1386-000-003||1992 Dodge Viper||330||2.66:1||1.78:1||1.30:1||1.00:1||0.74:1||0.50:1||2.90:1||26||30
|-
|1386-000-005||1993-1995 Dodge Viper||550||2.66:1||1.78:1||1.30:1||1.00:1||0.74:1||0.50:1||2.90:1||26||30
|-
|1386-000-006||1993 Camaro/Firebird w/2.73 final drive "M28"||350||3.36:1||2.07:1||1.35:1||1.00:1||0.80:1||0.62:1||3.28:1||26||27
|-
|1386-000-007||1993 Camaro/Firebird w/3.23 final drive "M29"||400||2.97:1||2.07:1||1.43:1||1.00:1||0.80:1||0.62:1||3.28:1||26||27
|-
|1386-000-009||1994-1995 Camaro/Firebird||450||2.66:1||1.78:1||1.30:1||1.00:1||0.74:1||0.50:1||2.90:1||26||27
|-
|1386-000-011||GM Aftermarket||450||2.97:1||2.07:1||1.43:1||1.00:1||0.80:1||0.62:1||3.28:1||26||27
|-
|1386-000-012||Mustang 5.0 Aftermarket||450||2.97:1||2.07:1||1.43:1||1.00:1||0.80:1||0.62:1||3.28:1||10||31
|-
|1386-000-013||Holden||450||2.66:1||1.78:1||1.30:1||1.00:1||0.74:1||0.50:1||2.90:1||26||27
|-
|1386-000-014||1996-2002 Dodge Viper||||2.66:1||1.78:1||1.30:1||1.00:1||0.74:1||0.50:1||2.90:1||26||30
|-
|1386-000-016||1996-1997 Camaro/Firebird||450||2.66:1||1.78:1||1.30:1||1.00:1||0.74:1||0.50:1||2.90:1||26||27
|-
|1386-000-017||1998 Camaro/Firebird||450||2.66:1||1.78:1||1.30:1||1.00:1||0.74:1||0.50:1||2.90:1||26||27
|-
|1386-000-018||1996-2002 Dodge Viper||450||2.66:1||1.78:1||1.30:1||1.00:1||0.74:1||0.50:1||2.90:1||26||30
|-
|1386-000-019||||390||2.66:1||1.78:1||1.30:1||1.00:1||0.74:1||0.50:1||2.90:1||||
|-
|1386-000-020||1999-2002 Camaro/Firebird||450|||2.66:1||1.78:1||1.30:1||1.00:1||0.74:1||0.50:1||2.90:1||26||27
|-
|1386-000-021||Aston Martin||450||2.66:1||1.78:1||1.30:1||1.00:1||0.79:1||0.63:1||2.90:1||26||30
|-
|1386-000-022||Holden Commodore||350||2.66:1||1.78:1||1.30:1||1.00:1||0.74:1||0.50:1||2.90:1||26||27
|-
|1386-000-023||Corvette C5||375||2.66:1||1.78:1||1.30:1||1.00:1||0.74:1||0.50:1||2.90:1||26||27
|-
|1386-000-024||||375||2.66:1||1.78:1||1.30:1||1.00:1||0.74:1||0.50:1||2.90:1||||
|-
|1386-000-025||Corvette Z06 C5||385||2.97:1||2.07:1||1.43:1||1.00:1||0.84:1||0.56:1||2.90:1||26||27
|-
|TNET-1077||||415||2.97:1||1.78:1||1.30:1||1.00:1||0.74:1||0.50:1||2.90:1||||
|-
|TNET-1247||Dodge Viper||450||2.66:1||1.78:1||1.30:1||1.00:1||0.74:1||0.50:1||2.90:1||26||30
|-
|TUET-1259||4.6 Mustang Aftermarket w/mech speedo||450||2.97:1||2.07:1||1.43:1||1.00:1||0.80:1||0.62:1||3.28:1||10||31
|-
|TUET-1260||4.6 Mustang Aftermarket w/elec speedo||450||2.97:1||2.07:1||1.43:1||1.00:1||0.80:1||0.62:1||3.28:1||10||31
|-
|TUET-1452||Chevrolet Corvette||370||2.66:1||1.78:1||1.30:1||1.00:1||0.74:1||0.50:1||2.90:1||26||27
|-
|TUET-1453||Chevrolet Corvette||370||2.66:1||1.78:1||1.30:1||1.00:1||0.74:1||0.50:1||2.90:1||26||27
|-
|TUET-1576||Aston Martin||415||2.66:1||1.78:1||1.30:1||1.00:1||0.79:1||0.63:1||2.90:1||26||30
|-
|TUET-1660||||350||2.66:1||1.78:1||1.30:1||1.00:1||0.74:1||0.50:1||2.90:1||||27
|-
|TUET-1694||2003-2004 Mustang Cobra||450||2.66:1||1.78:1||1.30:1||1.00:1||0.79:1||0.63:1||2.90:1||26||31
|-
|TUET-1806||Dodge Viper SRT-10||550||2.66:1||1.78:1||1.30:1||1.00:1||0.74:1||0.50:1||2.90:1||26||30
|-
|TUET-2022||Cadillac CTS-V||||2.97:1||2.07:1||1.43:1||1.00:1||0.84:1||0.56:1||2.90:1||||
|-
|TUET-2060||Mustang Cobra||450||2.97:1||2.07:1||1.43:1||1.00:1||0.80:1||0.62:1||3.28:1||10||31
|-
|TUET-2062||Dodge Viper||550||2.66:1||1.78:1||1.30:1||1.00:1||0.74:1||0.50:1||2.90:1||26||30
|-
|TUET-2066||Pontiac GTO/Holden Monaro||||2.97:1||2.07:1||1.43:1||1.00:1||0.84:1||0.56:1||2.90:1||26||27
|-
|TUET-5044||Cadillac CTS-V||||2.97:1||2.07:1||1.43:1||1.00:1||0.84:1||0.56:1||2.90:1||||
|-
|TUET-6450||T-56 Ford N/A XR6||||3.35:1||2.07:1||1.35:1||1.00:1||0.80:1||0.63:1||||23||31
|-
|TUET-7477||T-56 Magnum Chevy Aftermarket||||2.66:1||1.78:1||1.30:1||1.00:1||0.80:1||0.63:1||||26||27
|-
|TUET-7484||T-56 Magnum Ford Aftermarket||||2.66:1||1.78:1||1.30:1||1.00:1||0.80:1||0.63:1||||10||31
|-
|TUET-8274||T-56 Magnum Ford Aftermarket||||2.97:1||2.10:1||1.46:1||1.00:1||0.74:1||0.50:1||||10||31
|-
|TUET-8277||T-56 Magnum Chevy Aftermarket||||2.97:1||2.10:1||1.46:1||1.00:1||0.74:1||0.50:1||||26||27
|}

====T56 transmission ratios- 1993 F-body with 2.73:1 axle:====
*Reverse - 3.28
*First - 3.36
*Second - 2.07
*Third - 1.35
*Fourth - 1.00
*Fifth - 0.80
*Sixth - 0.62

====T56 transmission ratios- 1993 F-body, 3.23:1 axle:====
*Reverse - 3.28
*First - 2.97
*Second - 2.07
*Third - 1.43
*Fourth - 1.00
*Fifth - 0.80
*Sixth - 0.62

====T56 transmission ratios- 1994-current GM production:====
*Reverse - 2.90
*First - 2.66
*Second - 1.78
*Third - 1.30
*Fourth - 1.00
*Fifth - 0.74
*Sixth - 0.50

[[File:Tremec dimensions.jpg|thumb|400px|left|T56. Note the multiple options for shifter mounting positions.]] 
<br style="clear:both"/>

===T56 transmission torque specs=== 
*Backup lamp switch 20 ft/lb
*Clutch actuator cylinder bolt 71 in/lb
*Clutch housing bolt 37 ft/lb
*Control lever handle bolt 18 ft/lb
*Gear select/skip shift solenoid 30 ft/lb
*Reverse lockout assembly bolt 13 ft/lb
*Reverse lockout solenoid 30 ft/lb
*Shift control bolt 13 ft/lb
*Shift control closeout Boot Bolt 18 in/lb
*Shift control knob 27 ft/lb
*Transmission bolt 37 ft/lb
*Transmission drain/fill plug 20 ft/lb
*Transmission mount bolt 38 ft/lb
*Transmission mount nut 77 ft/lb
*Transmission support bolt 66 ft/lb
*Vehicle speed sensor bolt 89 ft/lb

===NV5600===
[[File:Nv5600 dimens1.jpg]]<table style="float: right;" border="1" cellpadding="2" cellspacing="0"><tr> 
          <td colspan="2" bgcolor="#FFf8dc" align = "center"><b>NV5600<br>Gear Ratio</b></td>
        </tr>
        <tr> 
          <td><b>&nbsp;&nbsp;1st</b></td>
          <td><b>5.63</b></td>
        </tr>
        <tr> 
          <td><b>&nbsp;&nbsp;2nd</b></td>
          <td><b>3.38</b></td>
        </tr>
        <tr> 
          <td><b>&nbsp;&nbsp;3rd</b></td>
          <td><b>2.04</b></td>
        </tr>
        <tr> 
          <td><b>&nbsp;&nbsp;4th</b></td>
          <td><b>1.39</b></td>
        </tr>
        <tr> 
          <td><b>&nbsp;&nbsp;5th</b></td>
          <td><b>1.00</b></td>
        </tr>
        <tr> 
          <td><b>&nbsp;&nbsp;6th</b></td>
          <td><b>0.73</b></td>
        </tr>
        <tr> 
          <td> 
            <center><b>R</b> 
            </center>
          </td>
          <td><b>5.63</b></td>
        </tr>
      </table>
[[File:NV5600.jpg|frame|left|NV5600]]
Designed by New Venture, this stout truck six speed is up to the task of living behind engines like the Duramax and 8100 Vortec. It has a limited application for use in hot rods due to its huge size, excessive weight, and truck-like gear ratios. 

;There are two versions of the NV5600<nowiki>:</nowiki>
*The Ram version is rated for 550 lb-ft torque
*A HD version for larger trucks is rated for 650 lb-ft torque
<br style="clear:both"/>

==Automatic transmissions==
'''GM automatic transmission gear ratios'''
<table border="5" cellpadding="5" cellspacing="0" height="15" width="500">
<tr><td></td><td><b>1st </b></td><td><b>2nd </b></td><td><b>3rd </b></td><td><b>4th</b> </td><td><b>Reverse</b></td></tr>

<tr><td>Powerglide</td><td>1.76</td><td>1.00</td><td></td><td></td><td>1.76</td></tr>
<tr><td>TH350</td><td>2.52</td><td>1.52</td><td>1.00</td><td></td><td>1.93</td></tr>
<tr><td>TH400</td><td>2.48</td><td>1.48</td><td>1.00</td><td></td><td>2.00</td></tr>
<tr><td>200r4</td><td>2.74</td><td>1.57</td><td>1.00</td><td>0.67</td><td>2.07</td></tr>
<tr><td>700r4</td><td>3.06</td><td>1.62</td><td>1.00</td><td>0.70</td><td>2.29</td></tr>
<tr><td>4L60E</td><td>3.06</td><td>1.62</td><td>1.00</td><td>0.70</td><td>2.29</td></tr>
<tr><td>4L80E</td><td>2.48</td><td>1.48</td><td>1.00</td><td>0.75</td><td>2.08</td>
</table>
<br><br>
<table style="border-collapse: collapse" border="0" bordercolor="#111111" cellpadding="0" cellspacing="0" height="6" width="90%"><tr>
         <td bordercolorlight="#FFCCCC" bordercolordark="#800080" style="border-style: outset; bgcolor=" bgcolor="#CCCCFF" height="20" width="100%">
    <p align="center">
    <font color="#000000" size=“2”><b>GM RWD Non-Electronic Transmissions</b></font></p></td>
    </tr></table>
<table style="border-collapse: collapse" bgcolor="#FFF8DC" border="0" bordercolor="#111111" cellpadding="0" cellspacing="0" height="6" width="90%">
     <tr><td bordercolorlight="#FFCCCC" bordercolordark="#800080" style="border-style: outset; " bgcolor="#FFF8DC" height="15" width="15%">
    <p align="center">
    <font size=“2”><b>Earlier transmissions</b></font></p></td>
    <td bordercolorlight="#FFCCCC" bordercolordark="#800080" style="border-right-style: outset;  border-top-style: solid; border-top-width: 1; border-bottom-style: solid; border-bottom-width: 1" bgcolor="#FFF8DC" height="20" width="100%">
    <font size=“2”>&nbsp;1946-'73: See '''[[General Motors transmissions#Early GM automatic transmissions|Early GM automatic transmissions]]'''</font></td>
    </tr>
     <tr><td bordercolorlight="#FFCCCC" bordercolordark="#800080" style="border-style: outset; " bgcolor="#FFF8DC" height="15" width="15%">
    <p align="center">
      <b><font size=“2”>TH180</font></b></p></td>
    <td bordercolorlight="#FFCCCC" bordercolordark="#800080" style="border-right-style: outset;  border-top-style: solid; border-top-width: 1; border-bottom-style: solid; border-bottom-width: 1" bgcolor="#FFF8DC" height="20" width="100%">
    <font size=“2”>&nbsp;3-speed 1969-'79</font></td>
    </tr>

     <tr><td bordercolorlight="#FFCCCC" bordercolordark="#800080" style="border-style: outset; " bgcolor="#FFF8DC" height="15" width="15%">
    <p align="center">
      <b><font size=“2”>TH180C</font></b></p></td>
    <td bordercolorlight="#FFCCCC" bordercolordark="#800080" style="border-right-style: outset;  border-top-style: solid; border-top-width: 1; border-bottom-style: solid; border-bottom-width: 1" bgcolor="#FFF8DC" height="20" width="100%">
    <font size=“2”>&nbsp;3-speed 1980-up electronic torque converter lock-up (TCC)</font></td>
    </tr>
 <tr><td bordercolorlight="#FFCCCC" bordercolordark="#800080" style="border-style: outset; " bgcolor="#FFF8DC" height="15" width="15%">
    <p align="center">
      <font size=“2”><b>TH200</b></font></p></td>
    <td bordercolorlight="#FFCCCC" bordercolordark="#800080" style="border-right-style: outset;  border-top-style: solid; border-top-width: 1; border-bottom-style: solid; border-bottom-width: 1" bgcolor="#FFF8DC" height="20" width="100%">
    <font size=“2”>&nbsp;3-speed 1976-'80</font></td>
    </tr>
 <tr><td bordercolorlight="#FFCCCC" bordercolordark="#800080" style="border-style: outset; " bgcolor="#FFF8DC" height="15" width="15%">
    <p align="center">
      <font size=“2”><b>TH200C</b></font></p></td>
    <td bordercolorlight="#FFCCCC" bordercolordark="#800080" style="border-right-style: outset;  border-top-style: solid; border-top-width: 1; border-bottom-style: solid; border-bottom-width: 1" bgcolor="#FFF8DC" height="20" width="100%">
    <font size=“2”>&nbsp;3-speed 1981-'87 electronic torque converter lock-up (TCC)</font></td>
    </tr>
 <tr><td bordercolorlight="#FFCCCC" bordercolordark="#800080" style="border-style: outset; " bgcolor="#FFF8DC" height="15" width="15%">
    <p align="center">
      <b><font size=“2”>
      TH350</font></b></p></td>
    <td bordercolorlight="#FFCCCC" bordercolordark="#800080" style="border-right-style: outset;  border-top-style: solid; border-top-width: 1; border-bottom-style: solid; border-bottom-width: 1" bgcolor="#FFF8DC" height="20" width="100%">
    <font size=“2”>&nbsp;3-speed 1969-'80</font></td>
    </tr>
 <tr><td bordercolorlight="#FFCCCC" bordercolordark="#800080" style="border-style: outset; " bgcolor="#FFF8DC" height="15" width="15%">
    <p align="center">
      <b><font size=“2”>
      TH350C</font></b></p></td>
    <td bordercolorlight="#FFCCCC" bordercolordark="#800080" style="border-right-style: outset;  border-top-style: solid; border-top-width: 1; border-bottom-style: solid; border-bottom-width: 1" bgcolor="#FFF8DC" height="20" width="100%">
    <font size=“2”>&nbsp;3-speed 1981-'86 lock-up torque converter (TCC)</font></td>
    </tr>
     <tr><td bordercolorlight="#FFCCCC" bordercolordark="#800080" style="border-style: outset; " bgcolor="#FFF8DC" height="15" width="15%">
    <p align="center">
      <font size=“2”><b>TH400 </b></font></p></td>
    <td bordercolorlight="#FFCCCC" bordercolordark="#800080" style="border-right-style: outset;  border-top-style: solid; border-top-width: 1; border-bottom-style: solid; border-bottom-width: 1" bgcolor="#FFF8DC" height="20" width="100%">
    <font size=“2”>&nbsp;3-speed 1964-'98 electric kick down</font></td>
    </tr>
 <tr><td bordercolorlight="#FFCCCC" bordercolordark="#800080" style="border-style: outset; " bgcolor="#FFF8DC" height="15" width="15%">
    <p align="center">
      <font size=“2”><b>TH2004R</b></font><b></b></p></td>
    <td bordercolorlight="#FFCCCC" bordercolordark="#800080" style="border-right-style: outset;  border-top-style: solid; border-top-width: 1; border-bottom-style: solid; border-bottom-width: 1" bgcolor="#FFF8DC" height="20" width="100%">
    <font size=“2”>&nbsp;Overdrive 1981-'90</font></td>
    </tr>
 <tr><td bordercolorlight="#FFCCCC" bordercolordark="#800080" style="border-style: outset; " bgcolor="#FFF8DC" height="15" width="15%">
    <p align="center">
      <font size=“2”><b>TH700R4</b></font></p></td>
    <td bordercolorlight="#FFCCCC" bordercolordark="#800080" style="border-right-style: outset;  border-top-style: solid; border-top-width: 1; border-bottom-style: solid; border-bottom-width: 1" bgcolor="#FFF8DC" height="20" width="100%">
    <font size=“2”>&nbsp;Overdrive 1981-'92 electronic torque converter lock-up (TCC)</font></td>
    </tr>
 <tr><td bordercolorlight="#FFCCCC" bordercolordark="#800080" style="border-style: outset; " bgcolor="#FFF8DC" height="15" width="15%">
    <p align="center">
      <b><font size=“2”>A44DE</font></b></p></td>
    <td bordercolorlight="#FFCCCC" bordercolordark="#800080" style="border-right-style: outset;  border-top-style: solid; border-top-width: 1; border-bottom-style: solid; border-bottom-width: 1" bgcolor="#FFF8DC" height="20" width="100%">
    <font size=“2”>&nbsp;Overdrive 1992-up lock-up torque converter (TCC) GEO Tracker</font></td>
    </tr>
</table><table style="border-collapse: collapse" border="0" bordercolor="#111111" cellpadding="0" cellspacing="0" height="6" width="90%">
  <tr>
    <td bordercolorlight="#FFCCCC" bordercolordark="#800080" style="border-style: outset; bgcolor=" bgcolor="#CCCCFF" height="20" width="100%">
    <p align="center">
      <font color="#000000" size=“2”>&nbsp;<b> GM RWD Computer 
      Controlled Transmissions</b></font></p></td>
    </tr></table>
<table style="border-collapse: collapse" bgcolor="#FFF8DC" border="0" bordercolor="#111111" cellpadding="0" cellspacing="0" height="6" width="90%">
 <tr><td bordercolorlight="#FFCCCC" bordercolordark="#800080" style="border-style: outset; " bgcolor="#FFF8DC" height="15" width="15%">
    <p align="center">
    
    <font size="5">&nbsp;</font><b><font size=“2”>4L30E</font></b></p></td>
    <td bordercolorlight="#FFCCCC" bordercolordark="#800080" style="border-right-style: outset;  border-top-style: solid; border-top-width: 1; border-bottom-style: solid; border-bottom-width: 1" bgcolor="#FFF8DC" height="20" width="100%">
    <font size=“2”>&nbsp;Electronic overdrive 1990-up</font></td>
  </tr> 
 <tr><td bordercolorlight="#FFCCCC" bordercolordark="#800080" style="border-style: outset; " bgcolor="#FFF8DC" height="15" width="15%">
    <p align="center">
      <font size=“2”><b>4L60E</b></font></p></td>
    <td bordercolorlight="#FFCCCC" bordercolordark="#800080" style="border-right-style: outset;  border-top-style: solid; border-top-width: 1; border-bottom-style: solid; border-bottom-width: 1" bgcolor="#FFF8DC" height="20" width="100%">
    <font size=“2”>&nbsp;Electronic overdrive 1993-up</font></td>
  </tr>
 <tr><td bordercolorlight="#FFCCCC" bordercolordark="#800080" style="border-style: outset; " bgcolor="#FFF8DC" height="15" width="15%">
    <p align="center">
      <b><font size=“2”>
      4L80E</font></b></p></td>
    <td bordercolorlight="#FFCCCC" bordercolordark="#800080" style="border-right-style: outset;  border-top-style: solid; border-top-width: 1; border-bottom-style: solid; border-bottom-width: 1" bgcolor="#FFF8DC" height="20" width="100%">
    <font size=“2”>&nbsp;Electronic overdrive 1991-up full size trucks only</font></td>
  </tr>
   <tr><td bordercolorlight="#FFCCCC" bordercolordark="#800080" style="border-style: outset; " bgcolor="#FFF8DC" height="15" width="15%">
    <p align="center">
      <font size=“2”><b>5L40E</b></font></p></td>
    <td bordercolorlight="#FFCCCC" bordercolordark="#800080" style="border-right-style: outset;  border-top-style: solid; border-top-width: 1; border-bottom-style: solid; border-bottom-width: 1" bgcolor="#FFF8DC" height="20" width="100%">
    <font size=“2”>&nbsp;Electronic overdrive 1999-up (5-speed) Cadillac Catera and CTS, late 2006-2010 Pontiac Solstice and Saturn Sky</font></td>
    </tr>
     <tr><td bordercolorlight="#FFCCCC" bordercolordark="#800080" style="border-style: outset; " bgcolor="#FFF8DC" height="15" width="15%">
    <p align="center">
      <font size=“2”></font><font size=“2”><b>
      6L80E</b></font></p></td>
    <td bordercolorlight="#FFCCCC" bordercolordark="#800080" style="border-right-style: outset;  border-top-style: solid; border-top-width: 1; border-bottom-style: solid; border-bottom-width: 1" bgcolor="#FFF8DC" height="20" width="100%">
<font size=“2”>&nbsp;Electronic overdrive 2006-up (6-speed) initially in Corvette, Cadillac XLR-V and Cadillac STS-V</font></td>
    </tr>
 <tr><td bordercolorlight="#FFCCCC" bordercolordark="#800080" style="border-style: outset; " bgcolor="#FFF8DC" height="15" width="15%">
    <p align="center">
      <font size=“2”></font><font size=“2”><b>
      6L90E</b></font></p></td>
    <td bordercolorlight="#FFCCCC" bordercolordark="#800080" style="border-right-style: outset;  border-top-style: solid; border-top-width: 1; border-bottom-style: solid; border-bottom-width: 1" bgcolor="#FFF8DC" height="20" width="100%">
    <font size=“2”>&nbsp;Electronic overdrive 2005-up (6-speed) Cadillac STS</font></td>
    </tr>
 <tr><td bordercolorlight="#FFCCCC" bordercolordark="#800080" style="border-style: outset; " bgcolor="#FFF8DC" height="15" width="15%">
    <p align="center">
      <font size=“2”><b>Allison 1000/2000</b></font></p></td>
    <td bordercolorlight="#FFCCCC" bordercolordark="#800080" style="border-right-style: outset;  border-top-style: solid; border-top-width: 1; border-bottom-style: solid; border-bottom-width: 1" bgcolor="#FFF8DC" height="20" width="100%">
    <font size=“2”>&nbsp;Electronic overdrive 2000-up (5-speed) full size trucks only</font></td>
  </tr>
 <tr><td bordercolorlight="#FFCCCC" bordercolordark="#800080" style="border-style: outset; " bgcolor="#FFF8DC" height="15" width="15%">
    <p align="center">
      <font size=“2”><b>JR403E</b></font></p></td>
    <td bordercolorlight="#FFCCCC" bordercolordark="#800080" style="border-right-style: outset;  border-top-style: solid; border-top-width: 1; border-bottom-style: solid; border-bottom-width: 1" bgcolor="#FFF8DC" height="20" width="100%">
    <font size=“2”>&nbsp;Electronic overdrive 1988-up</font></td>
  </tr>

  </table><table style="border-collapse: collapse" border="0" bordercolor="#111111" cellpadding="0" cellspacing="0" height="6" width="90%">
  <tr>
    <td bordercolorlight="#FFCCCC" bordercolordark="#800080" style="border-style: outset; bgcolor=" bgcolor="#CCCCFF" height="20" width="100%">
    <p align="center">
      <font color="#000000" size=“2”>&nbsp;<b> GM FWD 
      Non-Electronic Transmissions</b></font></p></td>
    </tr></table>
<table style="border-collapse: collapse" bgcolor="#FFF8DC" border="0" bordercolor="#111111" cellpadding="0" cellspacing="0" height="6" width="90%">
 <tr><td bordercolorlight="#FFCCCC" bordercolordark="#800080" style="border-style: outset; " bgcolor="#FFF8DC" height="15" width="15%">
    <p align="center">
    
    <font size=“2”><b>TH125</b></font></p></td>
    <td bordercolorlight="#FFCCCC" bordercolordark="#800080" style="border-right-style: outset;  border-top-style: solid; border-top-width: 1; border-bottom-style: solid; border-bottom-width: 1" bgcolor="#FFF8DC" height="20" width="100%">
    <font size=“2”>&nbsp;3-speed 1980-'81</font></td>
  </tr> 
 <tr><td bordercolorlight="#FFCCCC" bordercolordark="#800080" style="border-style: outset; " bgcolor="#FFF8DC" height="15" width="15%">
    <p align="center">
      <b>
      <font size=“2”>TH125C</font></b></p></td>
    <td bordercolorlight="#FFCCCC" bordercolordark="#800080" style="border-right-style: outset;  border-top-style: solid; border-top-width: 1; border-bottom-style: solid; border-bottom-width: 1" bgcolor="#FFF8DC" height="20" width="100%">
<font size=“2”>&nbsp;3-speed 1982-up electronic controlled lock-up torque converter 
    (TCC)</font></td>
  </tr>
 <tr><td bordercolorlight="#FFCCCC" bordercolordark="#800080" style="border-style: outset; " bgcolor="#FFF8DC" height="15" width="15%">
    <p align="center">
      <b><font size=“2”>TH325</font></b></p></td>
    <td bordercolorlight="#FFCCCC" bordercolordark="#800080" style="border-right-style: outset;  border-top-style: solid; border-top-width: 1; border-bottom-style: solid; border-bottom-width: 1" bgcolor="#FFF8DC" height="20" width="100%">
    <font size=“2”>&nbsp;3-speed 1979-'81</font></td>
  </tr>
 <tr><td bordercolorlight="#FFCCCC" bordercolordark="#800080" style="border-style: outset; " bgcolor="#FFF8DC" height="15" width="15%">
    <p align="center">
      <font size=“2”><b>TH3254L</b></font></p></td>
    <td bordercolorlight="#FFCCCC" bordercolordark="#800080" style="border-right-style: outset;  border-top-style: solid; border-top-width: 1; border-bottom-style: solid; border-bottom-width: 1" bgcolor="#FFF8DC" height="20" width="100%">
<font size=“2”>&nbsp;Overdrive 1982-'85 electronic controlled lock-up torque converter 
    (TCC)</font></td>
    </tr>
 <tr><td bordercolorlight="#FFCCCC" bordercolordark="#800080" style="border-style: outset; " bgcolor="#FFF8DC" height="15" width="15%">
    <p align="center">
      <font size=“2”><b>TH425</b></font></p></td>
    <td bordercolorlight="#FFCCCC" bordercolordark="#800080" style="border-right-style: outset;  border-top-style: solid; border-top-width: 1; border-bottom-style: solid; border-bottom-width: 1" bgcolor="#FFF8DC" height="20" width="100%">
    <font size=“2”>&nbsp;3-speed 1966-'78 (electric passing gear)</font></td>
  </tr>
 <tr><td bordercolorlight="#FFCCCC" bordercolordark="#800080" style="border-style: outset; " bgcolor="#FFF8DC" height="15" width="15%">
    <p align="center">
      <b><font size=“2”>440T4</font></b></p></td>
    <td bordercolorlight="#FFCCCC" bordercolordark="#800080" style="border-right-style: outset;  border-top-style: solid; border-top-width: 1; border-bottom-style: solid; border-bottom-width: 1" bgcolor="#FFF8DC" height="20" width="100%">
<font size=“2”>&nbsp;Overdrive 1985-'92 electronic controlled lock-up torque 
    converter (TCC)</font></td>
  </tr>
   <tr><td bordercolorlight="#FFCCCC" bordercolordark="#800080" style="border-style: outset; " bgcolor="#FFF8DC" height="15" width="15%">
    <p align="center">
      <font size=“2”><b>A131L</b></font></p></td>
    <td bordercolorlight="#FFCCCC" bordercolordark="#800080" style="border-right-style: outset;  border-top-style: solid; border-top-width: 1; border-bottom-style: solid; border-bottom-width: 1" bgcolor="#FFF8DC" height="20" width="100%">
    <font size=“2”>&nbsp;3-speed 1984-up Geo Prizm and Nova</font></td>
  </tr>
 <tr><td bordercolorlight="#FFCCCC" bordercolordark="#800080" style="border-style: outset; " bgcolor="#FFF8DC" height="15" width="15%">
    <p align="center">
      <font size=“2”><b>F3A</b></font></p></td>
    <td bordercolorlight="#FFCCCC" bordercolordark="#800080" style="border-right-style: outset;  border-top-style: solid; border-top-width: 1; border-bottom-style: solid; border-bottom-width: 1" bgcolor="#FFF8DC" height="20" width="100%">
    <font size=“2”>&nbsp;3-speed 1985-up Geo Storm, Spectrum &amp; Pontiac Sunburst</font></td>
  </tr>
  </table><table style="border-collapse: collapse" border="0" bordercolor="#111111" cellpadding="0" cellspacing="0" height="6" width="90%">
  <tr>
    <td bordercolorlight="#FFCCCC" bordercolordark="#800080" style="border-style: outset; bgcolor=" bgcolor="#CCCCFF" height="20" width="100%">
    <p align="center">
      <font color="#000000" size=“2”>&nbsp;<b> GM FWD 
      Computer Controlled Transmissions</b></font></p></td>
    </tr></table>
<table style="border-collapse: collapse" bgcolor="#FFF8DC" border="0" bordercolor="#111111" cellpadding="0" cellspacing="0" height="6" width="90%">
 <tr><td bordercolorlight="#FFCCCC" bordercolordark="#800080" style="border-style: outset; " bgcolor="#FFF8DC" height="15" width="15%">
    <p align="center">
    
    <font size=“2”><b>A210</b></font></p></td>
    <td bordercolorlight="#FFCCCC" bordercolordark="#800080" style="border-right-style: outset;  border-top-style: solid; border-top-width: 1; border-bottom-style: solid; border-bottom-width: 1" bgcolor="#FFF8DC" height="20" width="100%">
    <font size=“2”>&nbsp;3-speed 1985-up Geo Metro</font></td>
  </tr> 
 <tr><td bordercolorlight="#FFCCCC" bordercolordark="#800080" style="border-style: outset; " bgcolor="#FFF8DC" height="15" width="15%">
    <p align="center">
      <font size=“2”><b>A240E</b></font></p></td>
    <td bordercolorlight="#FFCCCC" bordercolordark="#800080" style="border-right-style: outset;  border-top-style: solid; border-top-width: 1; border-bottom-style: solid; border-bottom-width: 1" bgcolor="#FFF8DC" height="20" width="100%">
    <font size=“2”>&nbsp;Underdrive 1985-up Geo Prizm and Nova</font></td>
  </tr>
 <tr><td bordercolorlight="#FFCCCC" bordercolordark="#800080" style="border-style: outset; " bgcolor="#FFF8DC" height="15" width="15%">
    <p align="center">
      <b><font size=“2”>4T40E/4T45E</font></b></p></td>
    <td bordercolorlight="#FFCCCC" bordercolordark="#800080" style="border-right-style: outset;  border-top-style: solid; border-top-width: 1; border-bottom-style: solid; border-bottom-width: 1" bgcolor="#FFF8DC" height="20" width="100%">
    <font size=“2”>&nbsp;Electronic overdrive 1995-up Cavalier, Sunfire, Achieva and Cutlas</font></td>
  </tr>
 <tr><td bordercolorlight="#FFCCCC" bordercolordark="#800080" style="border-style: outset; " bgcolor="#FFF8DC" height="15" width="15%">
    <p align="center">
      <font size=“2”><b>4T60E</b></font></p></td>
    <td bordercolorlight="#FFCCCC" bordercolordark="#800080" style="border-right-style: outset;  border-top-style: solid; border-top-width: 1; border-bottom-style: solid; border-bottom-width: 1" bgcolor="#FFF8DC" height="20" width="100%">
    <font size=“2”>&nbsp;Electronic overdrive 1991-up</font></td>
    </tr>
 <tr><td bordercolorlight="#FFCCCC" bordercolordark="#800080" style="border-style: outset; " bgcolor="#FFF8DC" height="15" width="15%">
    <p align="center">
      <b><font size=“2”>
      4T65E</font></b></p></td>
    <td bordercolorlight="#FFCCCC" bordercolordark="#800080" style="border-right-style: outset;  border-top-style: solid; border-top-width: 1; border-bottom-style: solid; border-bottom-width: 1" bgcolor="#FFF8DC" height="20" width="100%">
    <font size=“2”>&nbsp;Electronic overdrive 1997-up</font></td>
  </tr>
 <tr><td bordercolorlight="#FFCCCC" bordercolordark="#800080" style="border-style: outset; " bgcolor="#FFF8DC" height="15" width="15%">
    <p align="center">
      <font size=“2”><b>4T80E</b></font></p></td>
    <td bordercolorlight="#FFCCCC" bordercolordark="#800080" style="border-right-style: outset;  border-top-style: solid; border-top-width: 1; border-bottom-style: solid; border-bottom-width: 1" bgcolor="#FFF8DC" height="20" width="100%">
    <font size=“2”>&nbsp;Electronic overdrive 1993-up Northstar</font></td>
  </tr>
   <tr><td bordercolorlight="#FFCCCC" bordercolordark="#800080" style="border-style: outset; " bgcolor="#FFF8DC" height="15" width="15%">
    <p align="center">
      <font size=“2”><b>JF403E</b></font></p></td>
    <td bordercolorlight="#FFCCCC" bordercolordark="#800080" style="border-right-style: outset;  border-top-style: solid; border-top-width: 1; border-bottom-style: solid; border-bottom-width: 1" bgcolor="#FFF8DC" height="20" width="100%">
    <font size=“2”>&nbsp;Electronic overdrive 1990-up Geo Storm</font></td>
  </tr>
 <tr><td bordercolorlight="#FFCCCC" bordercolordark="#800080" style="border-style: outset; " bgcolor="#FFF8DC" height="15" width="15%">
    <p align="center">
      <font size=“2”><b>TAAT</b></font></p></td>
    <td bordercolorlight="#FFCCCC" bordercolordark="#800080" style="border-right-style: outset;  border-top-style: solid; border-top-width: 1; border-bottom-style: solid; border-bottom-width: 1" bgcolor="#FFF8DC" height="20" width="100%">
    <font size=“2”>&nbsp;Electronic overdrive 1991-up Saturn S-Type</font></td>
  </tr>   <tr><td bordercolorlight="#FFCCCC" bordercolordark="#800080" style="border-style: outset; " bgcolor="#FFF8DC" height="15" width="15%">
    <p align="center">
      <font size=“2”><b>AF23-5/AF33-5</b></font></p></td>
    <td bordercolorlight="#FFCCCC" bordercolordark="#800080" style="border-right-style: outset;  border-top-style: solid; border-top-width: 1; border-bottom-style: solid; border-bottom-width: 1" bgcolor="#FFF8DC" height="20" width="100%">
<font size=“2”>&nbsp;Electronic 5-speed 2002-up Saturn Vue w/V6 and 2003-up Saturn Ion</font></td>
  </tr>   
   </table>

===Hydramatic===
The history of the Hydramatic transmission began back in 1932, when it was introduced by Cadillac as the "shiftless transmission". For more historical information, see [http://en.wikipedia.org/wiki/Hydramatic Hydramatic transmission] at Wikipedia. The scope of this article is mainly centered around the transmissions of the '60s to present date. However, if there is interest in prior years it can certainly be included.

===Turboglide===
The Turboglide was a relatively short-lived tranny used in the Chevrolet passenger car line. It basically has little to no performance potential and is not considered to be a particularly reliable or strong transmission. For that reason, the coverage is limited to the following section based closely on a post by Tomcars1 at trifive.com:

<Blockquote>  
The Turboglide was a sister transmission to the Buick Dynaflow. There were multiple versions of the Dynaflow throughout it lifetime- but the Turboglide is most closely related to the 1956 and later Triple-turbine Dynaflow , Flite-pitch Dynaflow and the later Buick Turbine drive. The Turboglide- I think- was the first diecast aluminum automatic that GM manufactured- it was for sure the first diecast aluminum automatic from Chevrolet. The Powerglide continued as a cast iron case automatic until 1962 when the Toledo Ohio transmission plant stopped making the Turboglide and began making the aluminum case Powerglide for the Chevy II on the same assembly line.
<br><br>
The difference between the Turboglide and other automatics (except for the Dynaflow) is that the Turboglide has a torque converter with three separate turbines in the one converter case, each of the three turbines are geared to the output shaft with different reduction ratios. Each of the three turbines functioned as a separate 'gear' with slightly overlapping effectiveness. The first turbine had 2.66:1 reduction and was good for starting the car and maxed out speed wise at 30 MPH. The second turbine began transmitting torque from 10 MPH and maxed out at 60 MPH. The third turbine began transmitting torque from about 15 MPH and was a direct drive to the output shaft. What this did was transmit torque from the engine to the output shaft without any 'gear shifting'- all of the torque was transmitted by hydraulic means.
<br><br>
The 1957 Turboglide was different from the later transmissions in that it used a cone shaped clutch to control the forward/reverse selection planetary gears. Cone clutches have a high surface area-to-space relationship, and have been used in other automatic transmissions and even early 20th. century manual clutches. But they tend to heat unevenly and warp- that is why we no longer have cone clutches for manual shift transmissions. When the Turboglide trans was shifted from forward to reverse while the car was still moving the cone clutch would get hot, warp and wear the friction face away quickly- causing a loss of locking grip and worn clutch material loose throughout the transmission- not a good situation for a long transmission life.
For all intents and purposes the Turboglide is a 3 speed automatic with no apparent shift points. The 1958 and later Turboglide replaced the cone clutch with the more common and durable plate clutches. This resolved the reliability problems- but the image of a problematic transmission was cast.
<br><br>
The 1957 trans is visually different from the later trans in that it has a pair of cast transmission mounts on its bellhousing: large flat surfaces cast at 45 degrees from the horizontal on the underside of the bellhousing. This is because the 1955-'57 Chevys had a perimeter frame and leaf rear springs. These had a 3 point engine/trans mounting system that required a single front engine mount and 2 bellhousing mounts. The 1957 trans is unique in that it also has a long extension housing (tail shaft housing) and a drain plug that the later trans do not. This makes it fairly easy to identify.
<br><br>
The 1958 and later Turboglides have a very short tail shaft, no mounts on the bellhousing and no drain plug in the pan. All of the Turboglide trannys function the same with only detail changes between them to improve reliability.
<br><br>
They all have a variable pitch (angle of incidence) stator in the center of the torque converter that changes the torque multiplication when the angle is changed. This feature gave the trans the feel of having a 'passing gear' when the throttle was fully depressed- causing he engine RPM to rise by 500-800. This feature could be found in some of the later GM transmissions and was discontinued at the end of the 1970s.
<br><br>
I do not know the torque ratings for these transmissions- but they were mounted behind the 315HP 348ci engine in full size Chevys (4500 lbs.) and survived. These are most like a present day hydraulic version of the AUDI/VW DSG dual clutch manual tranny in that more that one 'gear' is engaged at the same time: DSG- 2 gears, Turboglide- 3 gears.
<br><br>
The Turboglide as well as most of the other GM automatics of the time were phased out in favor of the TH350 and TH400 to reduce complexity and cost and to improve performance and reliability/durability.
</Blockquote>

==General Identification==

===Transmission identification by pan shape===
[[Image:Pan_id.jpg‎]]

{| border="1" cellpadding="2" cellspacing="0" bgcolor= "#FFF8DC" 
! bgcolor="#CCCCFF"|Image Number !!bgcolor="#CCCCFF"| Transmission(s) !!bgcolor="#CCCCFF"| Pan Bolts 
|-
!bgcolor="#CCCCFF"| 1
| Aluminum Powerglide 
| align = "center" | 14
|-
!bgcolor="#CCCCFF"| 2 
| TH200 (Metric), TH200C (Metric)
| align = "center" | 11
|-
! bgcolor="#CCCCFF"|3 
| TH250, TH250C, TH350, TH350C, TH375B
| align = "center" | 13
|-
!bgcolor="#CCCCFF"| 4 
| TH375C, TH400, TH475, 3L80, 3L80HD
| align = "center" | 13
|-
! bgcolor="#CCCCFF"|5 
| TH2004R 
| align = "center" | 16
|-
!bgcolor="#CCCCFF"| 6 
| TH700R4, 4L60, 4L60E 
| align = "center" | 16
|-
!bgcolor="#CCCCFF"| 7 
| 4L80E
| align = "center" | 17
|}
{{Note1}}Be careful not to mistake a TH250 for a TH350. The TH250 looks almost identical to the TH350 externally- same size, same oil pan. But unlike the TH350, it has a band adjuster stud and lock nut on the passenger side of the case near the cooler lines.

===Transmission dimensions===
[[File:Dimensions.jpg|center]]

*Dimension "A" is the overall transmission length and varies with the length of the extension housing used.
*Dimension "B" is the length of the main transmission case.
*Dimension "C" is the distance from the bellhousing to the center of the transmission mounting pad. 
**'''Note''': The mounting pad is usually part of the extension housing, but the graphic shows it on the main case. This means that dimension "C" is usually longer than dimension "B"
*Dimension "D" is the distance between the center of the mounting bolts - this is the "width" of the mounting pad.
*Dimension "E" is the width of the transmission at the bellhousing and combined with dimension "B", helps you roughly compare the size of the various transmissions.

<table id="table2" border="1" cellpadding="2" cellspacing="0" width="91%"> 
	<tr bgcolor="#CCCCFF">  
		<td width="120">'''Transmission'''</td>
		<td align="center" width="70">'''A'''</td>
		<td align="center" width="64">'''B'''</td>
		<td align="center" width="71">'''C'''</td>
		<td align="center" width="53">'''D'''</td>
		<td align="center" width="54">'''E'''</td>
		<td align="left" width="285">'''Notes'''</td>
	</tr>
	<tr>
		<td width="120">'''Powerglide'''</td>
		<td align="center" width="70">25-23/64"</td>
		<td align="center" width="64">16-5/16"</td>
		<td align="center" width="71">20-9/16"</td>
		<td align="center" width="53">3-3/4"</td>
		<td align="center" width="54">19"</td>
		<td align="left" width="285">Short shaft</td>
	</tr>
	<tr>
		<td width="120">'''Powerglide'''</td>
		<td align="center" width="70">27-9/16"</td>
		<td align="center" width="64">16-5/16"</td>
		<td align="center" width="71">20-9/16"</td>
		<td align="center" width="53">3-3/4"</td>
		<td align="center" width="54">19"</td>
		<td align="left" width="285">Long shaft</td>
	</tr>
	<tr>
		<td width="120">'''TH350'''</td>
		<td align="center" width="70">27-11/16"</td>
		<td align="center" width="64">21-5/8"</td>
		<td align="center" width="71">20-3/8"</td>
		<td align="center" width="53">3-3/4"</td>
		<td align="center" width="54">19-1/8"</td>
		<td align="left" width="285">6" extension housing</td>
	</tr>
	<tr>
		<td width="120">'''TH350'''</td>
		<td align="center" width="70">30-11/16"</td>
		<td align="center" width="64">21-5/8"</td>
		<td align="center" width="71">20-3/8"</td>
		<td align="center" width="53">3-3/4"</td>
		<td align="center" width="54">19-1/8"</td>
		<td align="left" width="285">9" extension housing</td>
	</tr>
	<tr>
		<td width="120">'''TH350'''</td>
		<td align="center" width="70">33-27/32"</td>
		<td align="center" width="64">21-5/8"</td>
		<td align="center" width="71">20-3/8"</td>
		<td align="center" width="53">3-3/4"</td>
		<td align="center" width="54">19-1/8"</td>
		<td align="left" width="285">12" extension housing</td>
	</tr>
	<tr>
		<td width="120">'''TH400/3L80'''</td>
		<td align="center" width="70">28-3/8"</td>
		<td align="center" width="64">24-5/16"</td>
		<td align="center" width="71">26-15/16"</td>
		<td align="center" width="53">4-1/4"</td>
		<td align="center" width="54">20"</td>
		<td align="left" width="285">4" extension housing</td>
	</tr>
	<tr>
		<td width="120">'''TH400/3L80'''</td>
		<td align="center" width="70">33-27/32"</td>
		<td align="center" width="64">24-5/16"</td>
		<td align="center" width="71">27-15/16"</td>
		<td align="center" width="53">4-1/4"</td>
		<td align="center" width="54">20"</td>
		<td align="left" width="285">9" extension housing</td>
	</tr>
	<tr>
		<td width="120">'''TH400/3L80'''</td>
		<td align="center" width="70">37-7/8"</td>
		<td align="center" width="64">24-5/16"</td>
		<td align="center" width="71">27-21/32"</td>
		<td align="center" width="53">1-3/4"</td>
		<td align="center" width="54">20"</td>
		<td align="left" width="285">13" extension housing</td>
	</tr>
	<tr>
		<td width="120">'''TH700R4/4L60'''</td>
		<td align="center" width="70">30-3/4"</td>
		<td align="center" width="64">23-3/8"</td>
		<td align="center" width="71">22-1/2"</td>
		<td align="center" width="53">3-3/4"</td>
		<td align="center" width="54">20"</td>
		<td align="left" width="285">All, except Corvette</td>
	</tr>
	<tr>
		<td width="120">'''TH700R4/4L60'''</td>
		<td align="center" width="70">29-7/8"</td>
		<td align="center" width="64">23-3/8"</td>
		<td align="center" width="71">22-1/2"</td>
		<td align="center" width="53">3-3/4"</td>
		<td align="center" width="54">20"</td>
		<td align="left" width="285">Corvette, 1982-'92</td>
	</tr>
	<tr>
		<td width="120">'''TH700R4/4L60'''</td>
		<td align="center" width="70">29-1/2"</td>
		<td align="center" width="64">23-3/8"</td>
		<td align="center" width="71">22-1/2"</td>
		<td align="center" width="53">3-3/4"</td>
		<td align="center" width="54">20"</td>
		<td align="left" width="285">With TH350 6" extension housing</td>
	</tr>
	<tr>
		<td width="120">'''TH700R4/4L60'''</td>
		<td align="center" width="70">30-1/2"</td>
		<td align="center" width="64">23-3/8"</td>
		<td align="center" width="71">28"</td>
		<td align="center" width="53">3-3/4"</td>
		<td align="center" width="54">20"</td>
		<td align="left" width="285">'''(1)'''Using mount on extension housing p/n 8673406 (old p/n 24214689)</td>
	</tr>
	<tr>
		<td width="120">'''TH2004R'''</td>
		<td align="center" width="70">27-11/16"</td>
		<td align="center" width="64">n/a</td>
		<td align="center" width="71">27"</td>
		<td align="center" width="53">3-3/4"</td>
		<td align="center" width="54">19-1/8"</td>
		<td align="left" width="285">Integral extension housing</td>
	</tr>
	<tr>
		<td width="120">'''4L60E'''</td>
		<td align="center" width="70">30-3/4"</td>
		<td align="center" width="64">23-3/8"</td>
		<td align="center" width="71">22-1/2"</td>
		<td align="center" width="53">3-3/4"</td>
		<td align="center" width="54">20"</td>
		<td align="left" width="285">All 1993-'95, except Corvette</td>
	</tr>
	<tr>
		<td width="120">'''4L60E'''</td>
		<td align="center" width="70">29-7/8"</td>
		<td align="center" width="64">23-3/8"</td>
		<td align="center" width="71">22-1/2"</td>
		<td align="center" width="53">3-3/4"</td>
		<td align="center" width="54">20"</td>
		<td align="left" width="285">Corvette, 1993-'95</td>
	</tr>
	<tr>
		<td width="120">'''4L60E'''</td>
		<td align="center" width="70">30-3/4"</td>
		<td align="center" width="64">21-3/4"</td>
		<td align="center" width="71">23-3/16"</td>
		<td align="center" width="53">3-3/4"</td>
		<td align="center" width="54">18-1/4"</td>
		<td align="left" width="285">All 1996-up, except Corvette and LS1</td>
	</tr>
	<tr>
		<td width="120">'''4L60E'''</td>
		<td align="center" width="70">31-5/32"</td>
		<td align="center" width="64">21-3/4"</td>
		<td align="center" width="71">23-19/32"</td>
		<td align="center" width="53">3-3/4"</td>
		<td align="center" width="54">18-1/4"</td>
		<td align="left" width="285">LS1, 1998-up</td>
	</tr>
	<tr>
		<td width="120">'''4L60E'''</td>
		<td align="center" width="70">n/a</td>
		<td align="center" width="64">n/a</td>
		<td align="center" width="71">n/a</td>
		<td align="center" width="53">n/a</td>
		<td align="center" width="54">n/a</td>
		<td align="left" width="285">Corvette transaxle, 1996-up </td>
	</tr>
	<tr>
		<td width="120">'''4L80E'''</td>
		<td align="center" width="70">32-11/16"</td>
		<td align="center" width="64">26"</td>
		<td align="center" width="71">30-3/8"</td>
		<td align="center" width="53">4-1/4"</td>
		<td align="center" width="54">20"</td>
		<td align="left" width="285">1991-up, std. duty; 2WD</td>
	</tr>
	<tr>
		<td width="120">'''4L80E'''</td>
		<td align="center" width="70">31-11/16"</td>
		<td align="center" width="64">26"</td>
		<td align="center" width="71">30-3/8"</td>
		<td align="center" width="53">4-1/4"</td>
		<td align="center" width="54">20"</td>
		<td align="left" width="285">1991-up, heavy duty; 2WD</td>
	</tr>
	<tr>
		<td width="120">'''4L80E'''</td>
		<td align="center" width="70">33"</td>
		<td align="center" width="64">26"</td>
		<td align="center" width="71">30-3/8"</td>
		<td align="center" width="53">4-1/4"</td>
		<td align="center" width="54">20"</td>
		<td align="left" width="285">1991-up, heavy duty; Long</td>
	</tr>
	<tr>
		<td width="120">'''4L80E'''</td>
		<td align="center" width="70">29"</td>
		<td align="center" width="64">26"</td>
		<td align="center" width="71">30-3/8"</td>
		<td align="center" width="53">n/a</td>
		<td align="center" width="54">20"</td>
		<td align="left" width="285">1991-up, 4WD</td>
	</tr>
</table>
;Note
'''(1)''' An extension housing p/n 8673406 (old p/n 24214689) is available for the TH700R4/4L60 transmission that moves the rear transmission mount to the same position as a TH400 (short-style 4” tail) or TH2004R transmission. This 7-3/8” long extension housing can eliminate transmission crossmember modifications when replacing a TH400 or TH2004R transmission with a 4L60 assembly.<br>

===Typical application information===

[[Image:Transmission_guidelines.jpg‎]]

==Early GM automatic transmissions==  
; [[General Motors transmissions#Automatic transmissions |Return to above]].
<table border="1" cellpadding="2" cellspacing="0"><tr><td bordercolorlight="#ffcccc" bordercolordark="#800080" style="border-style: outset; " bgcolor="#CCCCFF" height="15" width="15%">
    <p align="center">
    <font size=“2”><b>Hydramatic</b></font></p></td>
    <td bordercolorlight="#FFCCCC" bordercolordark="#800080" style="border-right-style: outset;  border-top-style: solid; border-top-width: 1; border-bottom-style: solid; border-bottom-width: 1" bgcolor="#fff8dc" height="20" width="100%">
    <font size=“2”>&nbsp;Hydramatic used in 1946-'63</font></td>
    </tr>
     <tr><td bordercolorlight="#FFCCCC" bordercolordark="#800080" style="border-style: outset; " bgcolor="#CCCCFF" height="15" width="15%">
    <p align="center">
    <b>
<font size=“2”>Dynaflow</font></b></p></td>
    <td bordercolorlight="#FFCCCC" bordercolordark="#800080" style="border-right-style: outset;  border-top-style: solid; border-top-width: 1; border-bottom-style: solid; border-bottom-width: 1" bgcolor="#FFF8DC" height="20" width="100%">
<font size=“2”>&nbsp;Dynaflow (2-speed) used in 1948-'63 Buick only</font></td>
    </tr>

     <tr><td bordercolorlight="#FFCCCC" bordercolordark="#800080" style="border-style: outset; " bgcolor="#CCCCFF" height="15" width="15%">
    <p align="center">
    <b>
    <font size=“2”>Cast iron<br>Powerglide</font></b></p></td>
    <td bordercolorlight="#FFCCCC" bordercolordark="#800080" style="border-right-style: outset;  border-top-style: solid; border-top-width: 1; border-bottom-style: solid; border-bottom-width: 1" bgcolor="#FFF8DC" height="20" width="100%">
    <font size=“2”>&nbsp;Cast iron case Powerglide (2-speed) used in 1950-'62 Chevrolet only</font></td>
    </tr>
 <tr><td bordercolorlight="#FFCCCC" bordercolordark="#800080" style="border-style: outset; " bgcolor="#CCCCFF" height="15" width="15%">
    <p align="center">
    <b>
    <font size=“2”>Jetaway 315</font></b></p></td>
    <td bordercolorlight="#FFCCCC" bordercolordark="#800080" style="border-right-style: outset;  border-top-style: solid; border-top-width: 1; border-bottom-style: solid; border-bottom-width: 1" bgcolor="#FFF8DC" height="20" width="100%">
    <font size=“2”>&nbsp;Jetaway 315 used in 1956-'64 Olds, Pontiac, Cadillac, AMC</font></td>
    </tr>
 <tr><td bordercolorlight="#FFCCCC" bordercolordark="#800080" style="border-style: outset; " bgcolor="#CCCCFF" height="15" width="15%">
    <p align="center">
    <b>
    <font size=“2”>TurboGlide</font></b></p></td>
    <td bordercolorlight="#FFCCCC" bordercolordark="#800080" style="border-right-style: outset;  border-top-style: solid; border-top-width: 1; border-bottom-style: solid; border-bottom-width: 1" bgcolor="#FFF8DC" height="20" width="100%">
    <font size=“2”>&nbsp;TurboGlide used in 1957-'61 Chevrolet only</font></td>
    </tr>
 <tr><td bordercolorlight="#FFCCCC" bordercolordark="#800080" style="border-style: outset; " bgcolor="#CCCCFF" height="15" width="15%">
    <p align="center">
    <b><font size=“2”>FlightPitch</font></b></p></td>
    <td bordercolorlight="#FFCCCC" bordercolordark="#800080" style="border-right-style: outset;  border-top-style: solid; border-top-width: 1; border-bottom-style: solid; border-bottom-width: 1" bgcolor="#FFF8DC" height="20" width="100%">
    <font size=“2”>&nbsp;FlightPitch used in 1958-'59 Buick only</font></td>
    </tr>
 <tr><td bordercolorlight="#FFCCCC" bordercolordark="#800080" style="border-style: outset; " bgcolor="#CCCCFF" height="15" width="15%">
    <p align="center">
    <b>
<font size=“2”>Corvair<br>Powerglide</font></b></p></td>
    <td bordercolorlight="#FFCCCC" bordercolordark="#800080" style="border-right-style: outset;  border-top-style: solid; border-top-width: 1; border-bottom-style: solid; border-bottom-width: 1" bgcolor="#FFF8DC" height="20" width="100%">
<font size=“2”>&nbsp;Corvair Powerglide (2-speed) used in 1960-'69 Corvair &amp; 1961-'63 Tempest only</font></td>
    </tr>
 <tr><td bordercolorlight="#FFCCCC" bordercolordark="#800080" style="border-style: outset; " bgcolor="#CCCCFF" height="15" width="15%">
    <p align="center">
    <b>
<font size=“2”>Buick Special</font></b></p></td>
    <td bordercolorlight="#FFCCCC" bordercolordark="#800080" style="border-right-style: outset;  border-top-style: solid; border-top-width: 1; border-bottom-style: solid; border-bottom-width: 1" bgcolor="#FFF8DC" height="20" width="100%">
<font size=“2”>&nbsp;Buick Special used in 1961-'63 Buick Special only</font></td>
    </tr>
  <tr><td bordercolorlight="#FFCCCC" bordercolordark="#800080" style="border-style: outset; " bgcolor="#CCCCFF" height="15" width="15%">
    <p align="center">
    <b>
    <font size=“2”>240 RHM</font></b></p></td>
    <td bordercolorlight="#FFCCCC" bordercolordark="#800080" style="border-right-style: outset;  border-top-style: solid; border-top-width: 1; border-bottom-style: solid; border-bottom-width: 1" bgcolor="#FFF8DC" height="20" width="100%">
    <font size=“2”>&nbsp;Roto-Hydramatic 240 used in 1961-'63 Olds F85 only</font></td>
    </tr>
 <tr><td bordercolorlight="#FFCCCC" bordercolordark="#800080" style="border-style: outset; " bgcolor="#CCCCFF" height="15" width="15%">
    <p align="center">
    <b><font size=“2”>375 RHM<br> (Slim Jim)</font></b></p></td>
    <td bordercolorlight="#FFCCCC" bordercolordark="#800080" style="border-right-style: outset;  border-top-style: solid; border-top-width: 1; border-bottom-style: solid; border-bottom-width: 1" bgcolor="#FFF8DC" height="20" width="100%">
    <font size=“2”>&nbsp;Roto-Hydramatic 375 (Slim Jim) used in 1961-'64 Olds, Pontiac</font></td>
    </tr>
<tr><td bordercolorlight="#FFCCCC" bordercolordark="#800080" style="border-style: outset; " bgcolor="#CCCCFF" height="15" width="15%">
    <p align="center">
    <b>
<font size=“2”>Aluminum<br>Powerglide</font></b></p></td>
    <td bordercolorlight="#FFCCCC" bordercolordark="#800080" style="border-right-style: outset;  border-top-style: solid; border-top-width: 1; border-bottom-style: solid; border-bottom-width: 1" bgcolor="#FFF8DC" height="20" width="100%">
    <font size=“2”>&nbsp;Aluminum Powerglide (2-speed) used in 1962-'73 Chevrolet only</font></td>
  </tr>
 <tr><td bordercolorlight="#FFCCCC" bordercolordark="#800080" style="border-style: outset; " bgcolor="#CCCCFF" height="15" width="15%">
    <p align="center">
    <b>
<font size=“2”>300 THM</font></b></p></td>
    <td bordercolorlight="#FFCCCC" bordercolordark="#800080" style="border-right-style: outset;  border-top-style: solid; border-top-width: 1; border-bottom-style: solid; border-bottom-width: 1" bgcolor="#FFF8DC" height="20" width="100%">
<font size=“2”>&nbsp;Super Turbine 300 (2-speed) used in 1964-'69 Buick, Olds, Pontiac</font></td>
    </tr></table>
<br>

== Two speed automatic==

===Powerglide===
[[File:CI PG driver1.jpg|thumb|400px|right|Cast iron Powerglide]]
The Powerglide transmission was used in Chevrolet vehicles from 1950 to '73. The cast iron PG was used from 1950-'62, the cast iron PG has no bottom pan. 

From [http://www.autotran.us/pgparts1.html autotran.us]:

*1953-'54 Corvette has a rear metal clad seal since it has an open driveline
*1955 uses the early internal lug style friction plates
*1956-up uses the internal spline style friction plates
*1957 is the only cast iron Powerglide that has three (3) 0.090" and two (2) 0.070" steel clutch plates, all others have five (5) 0.070" steel plates
*Some 1961, and most if not all 1962 Powerglides use the 12 tang steel clutch plates <br style="clear:both"/>

====Band adjustment====
*Low: 3 turns (with cushion spring)
*Low: 4 turns (without cushion spring)
*Reverse: 0.250" servo travel
;More at [[Transmission identification]].

===ST-300===
The 2-speed automatic used in Buick, Olds and Pontiac vehicles was known as the Super Turbine 300 or ST-300. The ST-300 transmission was similar to the Powerglide but few parts were directly interchangeable.  

The ST-300 was also produced with a variable pitch torque converter. This converter could change stall RPM with an electric solenoid inside the transmission that was activated by a switch usually mounted on the throttle linkage.

===Torque-Drive===
This was a low cost Powerglide-based transmission that used a manual valve body. It had to be manually shifted into high and down to low. It was sold under RPO MB1, and cost about $100 less than a Powerglide. It was available with 4 cylinder and 6 cylinder engines.

===Dynaflow===
When you say Buick "Dynaflow", it's like saying "Chevy engine". Some still mistakenly refer to the early '60s aircooled Buick Dual Path- as well as ALL Buick trannys up until the Turbo Hydramatic came out, for that matter- as a "Dynaflow".

There were a lot of iterations of the Dynaflow- beginning w/the early 1948-'49 version that acted something like a hydraulic version of a CVT tranny (it did have two "speeds", but selecting LOW would get you about 50 MPH, then you manually selected DRIVE).

By about 1953 the "Dynaflow" was replaced by the "Twin Turbine Dynaflow", which then became the "Variable Pitch Dynaflow", around 1955. 

This was followed in 1958 by a triple turbine Dynaflow. There was another short lived tri-turbine AT, the "Turboglide" that was used by Chevy as an option in 1957 until about 1960, known as the Buick "Flight-Pitch" Dynaflow. It lasted until 1959. The different transmissions can be identified by the difference in the shift quadrants; Twin Turbines had a P-N-D-L-R pattern, Triple Turbines were P-R-N-D-G. In 1959 Buick dropped the “Dynaflow” name, the Variable Pitch Dynaflow became the “Twin Turbine”, the Flight Pitch Dynaflow was now called the “Triple Turbine”.

1961 saw the subcompact Buick Skylark/Special come along w/the “Dual Path Turbine Drive”, usually  called  the “Dual Path”.  First gear was only about 1.6:1, so this was a bad design for acceleration if not for the car’s relatively decent power to weight ratio- at least w/the 4bbl V8 215 all aluminum engine- and the torque converter’s relatively high torque multiplication.

==Three speed automatic==
[[File:1972 th350 id.jpg|thumb|200px|TH350 accumulator with ID. "72" is year, "152" is a calibration code, "KE" is application code (link to application codes below)]]

===TH350, TH350C, TH375B===
the TH350 trans was built in 5 different lengths. Two were 4x4 applications. Tail housing lengths of the two wheel drive were 6 inch, 9 inch and 12 inches. The 12 inch length is not very common. It was used mostly in Buick AND Oldsmobile station wagons.

====TH350 model ID codes====
{|
|[[File:1972 th350 id.jpg|thumb|200px|TH350 accumulator with ID. "72" is year, "152" is a calibration code, "KE" is application code (link to application codes below)]]
|[[File:TH350 ID governor cover.jpg|frame|left|ID stamped into governor cover]]
|}
Codes for 1969-'72 TH350 transmissions are located on the accumulator; 1973-'81 TH350 codes are on the governor cover. Listings of the transmission application codes can be seen '''[http://www.teufert.net/trans/trans.htm HERE]'''.
<br style="clear:both"/>

====ID TH350C====
The TH350C input looks different than the TH350 non lockup type tranny. Below is the TH350C input:

[[File:350lockupinput1.jpg|220px]]
<br><br>
A non lockup TH350 input shaft looks like the one shown below:

[[file:350NONLOCK INPUT.jpg]]

====TH350 ratios====
*First: 2.52:1
*Second: 1.52:1
*High: 1:1

===TH400 (3L80), TH375C, TH475 (3L80HD)===
1987-up 3L80HD is the heavy duty version of the TH400 found in light trucks.  It has a 27 spline output shaft and is 34.5" long overall in the 2WD version. 'HD' is cast into the bellhousing in medium size letters.  The TH400 transmission was used between 1964-1990. 1987 was the year GM transmissions began using the alphanumeric designations.

====TH400 ratios====
*First: 2.48:1
*Second: 1.48:1
*High: 1:1

===Switch Pitch===
There are SP 400 and SP 300 transmissions. The name "switch pitch" comes from the vanes in the torque converter being able to change their angle (pitch) in order to increase the stall speed to get the vehicle moving easier. 

====SP 300====
These were found in 1964-'67 and were two-speed. The SP 300 converters are 12". Olds called it the '''Jetaway''', aka the '''Super Turbine 300'''.

The ST300 had a three element torque converter, a front and rear multiple disc clutch pack, and a compound planetary gearset with a front band and a clutch pack for reverse and manual low gear. The unit was cooled with a small auxiliary ATF cooler located beneath the engine radiator. It had an aluminum case and weighed 152 lb.

It was designed to start in low gear, providing a gear ratio of 1.765:1 plus the additional torque multiplication provided by the torque converter. The shift pattern was P-R-N-D-L. In Drive at full throttle, it would upshift from low gear to high gear at 60–65 mph.

From 1964-'67, Buick and Olds versions of this transmission used a torque converter with a variable-pitch stator called Switch Pitch by Buick and Variable Vane by Olds. The stator blades changed pitch by an electrical solenoid and a stator valve, controlled by a switch on the throttle linkage. At light to medium throttle, the stator blades were at 32°, providing a torque multiplication of 1.8:1 and a converter stall speed of approximately 1800 rpm. At ⅔ to full throttle, the blades switched to the 51° high stall position, giving torque multiplication of 2.45:1 and a stall speed of approximately 2300 rpm. The blades were also set to the high position at idle to limit creep when stopped in Drive. The variable pitch stator was eliminated after 1967. This feature was not used on the Pontiac versions of this transmission.

====SP 400====
Switch Pitch (SP) 400 transmissions were available from 1965-'67 in full size Buick, Olds and Cadillac cars. Torque converter diameter is 13". 

====SP ID====
The easiest way to identify the SP is by the pan shape shown below, right. On the SP 400, there are 3 concave and 1 convex dimples and a 'shoe heel' impression. The shoe heel impression is where the filter picks up fluid and the pickup is shaped just like a shoe heel (see photo above right). Filter is a Wix p/n 51879.
[[File:Th400SPpan.jpg|right|260px]]<br style="clear:both"/>

The SP transmission has a two-terminal electrical connector on the driver side of the case. The top terminal is for the SP converter: applying 12 VDC to it caused the converter to go to the higher stall setting. The default no-power position is low stall.

The lower terminal is for the kickdown solenoid. It's operated from the gas pedal or from a switch at the throttle arm of the carburetor.

*[http://www.buickperformanceclub.com/SPTrans.htm Buick Switch Pitch Transmissions] 
*[http://www.buickperformanceclub.com/switchpitch.htm Itching for a Switch Pitch Transmission]

====Converting TH400 to SP====
The SP pump, solenoid and converter can be retrofitted into the early TH400 case. The correct case for this will have a slightly different casting w/a drilled hole present. Later TH400 cases lack this, so the swap isn't possible.

===TH400 model ID codes===
A listing of the two letter model code found on the metal ID tag is '''[http://www.teufert.net/trans/t-400.htm HERE]''' (no info on Oldsmobile applications).

==Four speed automatic==

===TH2004R===
The TH2004R transmission is the same length as a 6 inch tail housing TH350 transmission. The TH2004R requires a TV cable hook up at the EFI or carb with the correct geometry for correct operation.

===TH700R4 (4L60)===

===4L60E===
4L60E is an electronic shifted and pressure controlled version of the 700R4 / 4L60 transmission.

===4L80E===
4L80E is a full electronic controlled and shifted transmission with similar design and strength to the T-400 trans. Early 4L80E and TH400 shared some parts that could be swapped. In 1996 the 4L80E has some design changes in lubrication circuits. You must be very careful when replacing gear train parts in late design 4L80E.

===6L80E, 6L90E===
General Motors 6 speed automatic. While some parts swap between the 6L80 and 6L90, there are differences to watch out for, such as a longer case length for the 6L90 as well as larger output and spline count. Verses the 32 splines of the 6L80.
[[File:6L90 trans.jpg|thumb|left|330px|6L90 transmission.]]
<br style="clear:both"/>

==Cooler lines==
{{Note1}}All except TH200C and TH2004R- which are opposite.
*Top line of the transmission = in '''''from''''' the cooler
*Bottom line of the transmission = out '''''to''''' the cooler

===TH350 adapters===
GM uses an adapter which threads into the case cooler ports and is sealed with a washer. The adapter converts the thread to inverted flare for hard line usage. The cooler ports on the TH350 are usually a female 1/4"-18 NPSM (National Pipe Straight Mechanical (NPSM)) and use a metal washer/seal. The NPSM threads will fit a NPT (tapered) fitting, but if a tapered fitting is to be used, be careful to not over tighten it.  

===TH350 fitting torque values===
*Straight pipe fitting- 20 ft/lb
*Tapered pipe fitting- 15 ft/lb

===TH400 fitting torque values===
*TH400 is 28 ft/lb.

==Bellhousing bolt patterns==
The following is a list of GM bellhousing patterns. This section is based on wiki article [http://en.wikipedia.org/wiki/List_of_GM_bellhousing_patterns List of GM bellhousing patterns].

===Chevrolet pattern===
[[image:Chevy_bell_pattern.jpg|thumb|300px|Chevy bolt pattern]]
  
* Chevrolet small and big block V8 
* GM 90° V6 (200/229/4.3L)
* GM [http://en.wikipedia.org/wiki/GM_Iron_Duke_engine Iron Duke] RWD inline 4 (early RWD variants, later versions may use a FWD pattern, and have two possible starter locations)
* Jeep with GM Iron Duke inline 4 2.5L/151cid (1980-'83). These use a MOPAR Torqueflite 904 automatic transmission with an integral Chevrolet bellhousing. Do not confuse with later AMC 2.5L engine that uses the GM metric pattern (see below).
* Chevrolet inline 6 (1963-up)
* Chevrolet 153 inline 4 (Chevy II, pre-Iron Duke, includes the Vortec 3000/181 industrial/marine crate engine)
* GM [http://en.wikipedia.org/wiki/GM_Atlas_engine Atlas engine]<br style="clear:both"/>

===Buick, Oldsmobile, Pontiac (BOP) V8 pattern===
[[image:BOP_bell_pattern.jpg|thumb|280px|BOP bolt pattern]] 

* Post-1965 Buick/Oldsmobile/Pontiac RWD V8
* Buick V8 1967-up 
* Buick pre-3800 90° RWD V6
* Jeep [http://en.wikipedia.org/wiki/Buick_V6_engine#Dauntless Dauntless 225cid oddfire V6] (1967-'74) 
* Cadillac cast iron V8 after 1967 (1968-'85 368, 425, 472 and 500cid V8)
Starters are on the driver side on Olds 350-455 and Pontiac, and the passenger side on Cadillac 425/472/500 and Buick 225/231/300/340/350/400/430/455.
<br style="clear:both"/>

====Adapters====
TCI and Trans-Dapt make adapter plates for mounting a BOP transmission to a Chevy engine or vice versa. They are plenty sturdy for all but the most demanding circumstances, and the cost is relatively low.
[[File:Tci detail.jpg|thumb|300px|left|TCI adapter p/n 230001 for Buick, Cadillac, Oldsmobile, Pontiac engines to Chevy transmissions]]<br style="clear:both"/>

[[File:WILCAP ADAPTOR EARLY HEMI TO TH350.jpg|200px|thumb|left|Wilcap adapter on early Hemi for using TH350 transmission]] <br style="clear:both"/>Wilcap offers an adapter to mount the TH350 tranny to the early Chrysler Hemi (above).<br style="clear:both"/>


===Uni-bell pattern===
This photo shows a multi-pattern case. Both the BOP and Chevrolet pattern on the same bellhousing.
[[image:Multi_pattern_bell.jpg|thumb|left|300px|Uni-bell pattern]]
<br style="clear:both"/>

===GM metric pattern===
[[File:GM 60deg V6 bellhousing.JPG|thumb|200px|GM 60 degree pattern]]
The GM metric pattern is also called the GM ''small corporate pattern'' and the ''S10 pattern''. This pattern has a distinctive odd-sided hexagonal shape. Rear wheel drive applications have the starter mounted on the passenger side of the block. The 2.2L S10/Sonoma had the starter located in the same position as front wheel drive cars. A rear wheel drive bellhousing is displayed at right.
* GM [http://en.wikipedia.org/wiki/GM_60-Degree_V6_engine 60 degree V6] 2.8/3.1/3.4/3.5/3.9L V6 (also used by AMC)
* [http://en.wikipedia.org/wiki/Buick_V6_engine Buick V6] 3300/3800 V6
* Cadillac [http://en.wikipedia.org/wiki/Cadillac_V8_engine#HT-4100 4.1/4.5/4.9L V8] 
* Isuzu 3.5L DOHC V6
* GM [http://en.wikipedia.org/wiki/GM_Iron_Duke_engine Iron Duke]/Tech-4 2.5L inline 4
* GM [http://en.wikipedia.org/wiki/GM_122_engine "122"] 1.8/2.0/2.2L inline 4
* AMC/[http://en.wikipedia.org/wiki/Chrysler_2.2_%26_2.5_engine#2.5 Chrysler 2.5L inline 4] engine found in Jeep Cherokee, Comanche, Wagoneer, CJ, Wrangler, and Dodge Dakota 
* GM [http://en.wikipedia.org/wiki/GM_LS_engine#5.3_L_2 5.3L LS4] V8
* GM [http://en.wikipedia.org/wiki/Northstar_engine_series#LX5_.28Shortstar.29 3.5L LX5 V6] "Shortstar" 
<br style="clear:both"/>

===Northstar pattern===
[[File:Northstar2.jpg|thumb|300px|Northstar pattern, somewhat resembles GM 60 degree pattern]]

Nearly identical to the GM small corporate/metric pattern, except that the starter is located between the cylinder banks, and the lower right bolt hole is moved outward by roughly one inch. It shares the distinctive odd-sided hexagonal shape of the 60 degree metric pattern. 
* Cadillac [http://en.wikipedia.org/wiki/Northstar_engine_series#Northstar_series Northstar V8] 
* [http://en.wikipedia.org/wiki/Oldsmobile_Aurora Oldsmobile Aurora] L47 V8
<br style="clear:both"/>

===GM Ecotec===
* GM [http://en.wikipedia.org/wiki/GM_Family_II_engine#Ecotec Ecotech] DOHC inline 4
[[File:Ecotec2.jpg|thumb|center|400px|Ecotec pattern]]
<br style="clear:both"/>

===Buick Nailhead round pattern===
1957 to 1966 364/401/425 Buick Nailhead engines share a unique bellhousing bolt pattern. Will not fit the 264/322 Nailhead engine made from 1953-'56. The 1953-'56 bellhousing/flywheel looks the same as the 1957-'66 Nailheads but they are about 1" larger.

===Buick and Rover aluminum V8 pattern===
[[File:215 bell.jpg|thumb|300px|Buick/Rover aluminum V8 pattern]]

*1961 through 1963 Buick/Oldsmobile/Pontiac [http://en.wikipedia.org/wiki/Buick_V8_engine#215 215ci aluminum V8]
**Buick 198ci V6
*1967 through 2004 [http://en.wikipedia.org/wiki/Rover_V8_engine Rover 3.5, 3.9, 4.0, 4.2, and 4.6L aluminum V8] (based on the 215 Buick aluminum V8)
<br style="clear:both"/>

===Cadillac V8, pre-1968 pattern===
{|
|[[File:331ID49-54.JPG|thumb|345px|center|Cad 1949-'54 331ci pattern. Note cast in partial bellhousing]]
|[[File:CADblockID.JPG|thumb|300px|center|Cad 1955-'64 331, 365, 390ci pattern]]
|}
Early Cadillacs manufactured from 1949 to 1954 used a "round top" bellhousing partially cast into the block casting. Around 1955 the bellhousing pattern was revised until the BOP bolt pattern was adopted.
<br style="clear:both"/>

==Speedometer==
===TH350, TH400, manual speedometer gear ===
*[http://www.tciauto.com/tc/speedometer-gear-calculator/ Speedometer gear info and calculator]
*[http://www.teufert.net/trans/speedo-gears.htm Speedometer gear usage chart]

==Fastener threads==
LX engine tranny to block bolts are metric: M10 x 1.5.

Using SAE bolts on a GM transmission mount after about 1978 will strip the mount threads. GM converted to metric mount bolts about 1978 even though most of the rest of the transmission bolts did not change until the TH700R4 and TH4L80/E came out.

TH350 and TH400 transmission mount, speedometer, and solenoid bolts went metric about 1978. All other bolts were SAE to the end of production.

TH200C, TH2004R, TH700R4, and later transmissions used metric fasteners.

==Case fluid plugs==
*[http://www.epcoproducts.com/magplugs.html EPCO Zero-Leak Gold plugs]

==Resources==
*[http://fiedlerh.home.att.net/BW.htm Borg Warner Second Design ST-10 4-Speed Info], codes, applications
*[http://pontiacpower.org/BW.htm Borg Warner Second Design ST-10 4-Speed Info] from Pontiac Power
*[http://www.chevyhiperformance.com/techarticles/46140_chevrolet_transmission_swap_guide/index.html Chevrolet Transmission Swap Guide - Swap Into Overdrive], a transmission swapping guide for early Chevrolets
*[http://www.wilcap.com/tech.html GM, MOPAR, and Ford bellhousing bolt patterns], including some manual tranny bolt patterns
*[http://www.maliburacing.com/auto_tranny_id.htm GM Automatic Transmission Identification and Information]
*[http://www.teufert.net/trans/tranny.htm Tranny info]
;Crankshaft Coalition Wiki articles
*[http://www.crankshaftcoalition.com/wiki/Category:Transmission Transmission category]
*[[Transmission identification]] 
*[[Transmission lube]]
*[[Torque converter]]
<br><br>

[[Category:Transmission]]
[[Category:Identification and decoding]]
[[Category:Good articles]]
[[Category:GM]]
{{develop1}}