Transmission identification
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= Preamble = | = Preamble = | ||
| − | + | This page is to acquaint people with the identification of popular North American transmissions based on pan shape, case outline, and OEM numbering. This page also offers overall dimension, gear ratios and number of gears available in each transmission, and originating year, make and model. | |
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| + | ==Casting numbers== | ||
| + | ==Date codes== | ||
| + | The date code format varied, but one date code that was used has a letter followed by two or three numbers. The letter is the month. The next number or two numbers will be the day of the month. The last number is the last digit of the year. | ||
| + | :Example: '''C124''' | ||
| + | :*C = March (A = Jan., B = Feb., etc.) | ||
| + | :*12 = day of the month | ||
| + | :*4 = year ending in 4, i.e. 1964, 1974, 1984, etc. | ||
=GM transmissions= | =GM transmissions= | ||
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====TH350 tailshaft (extension housing) lengths==== | ====TH350 tailshaft (extension housing) lengths==== | ||
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You will find the TH350 with 6", 9" and 12" tail housings. There is also a 4WD output, shown below: | You will find the TH350 with 6", 9" and 12" tail housings. There is also a 4WD output, shown below: | ||
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| align = "center" | 2.07 | | align = "center" | 2.07 | ||
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====Dimensions of common automatics==== | ====Dimensions of common automatics==== | ||
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[[Image:Transmission_guidelines.jpg|Typical application information.]] | [[Image:Transmission_guidelines.jpg|Typical application information.]] | ||
| − | + | ====Common bellhousing configurations==== | |
| − | ====Common | + | |
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Photo of a Chevrolet bell housing bolt pattern. Notice the peak between the top two bolt holes on the bell housing. | Photo of a Chevrolet bell housing bolt pattern. Notice the peak between the top two bolt holes on the bell housing. | ||
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[[File:Th350C unicase.jpg|thumb|left|400px|Universal GM bellhousing bolt pattern]] <br style="clear:both"/> | [[File:Th350C unicase.jpg|thumb|left|400px|Universal GM bellhousing bolt pattern]] <br style="clear:both"/> | ||
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===TH250, TH250C, TH350, TH350C, TH375B transmissions=== | ===TH250, TH250C, TH350, TH350C, TH375B transmissions=== | ||
| − | ====Identifying transmissions in the TH350 family | + | ====Identifying transmissions in the TH350 family==== |
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| − | Rear view of a | + | Rear view of a TH2004R transmission with BOP design bell housing bolt pattern. Notice the valley between the top two bolt holes. |
[[file:Buick-2004r.jpg|300px]] <br style="clear:both"/> | [[file:Buick-2004r.jpg|300px]] <br style="clear:both"/> | ||
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===General Information=== | ===General Information=== | ||
| − | ==== | + | ====Bellhousing bolt pattern and measurements==== |
[[File:9020Bellhousing_Bolt_Pattern.jpg]] | [[File:9020Bellhousing_Bolt_Pattern.jpg]] | ||
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===Muncie M20, M21, M22 transmissions=== | ===Muncie M20, M21, M22 transmissions=== | ||
| − | ====Identifying Muncie M20 series transmissions | + | ====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. | 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. | ||
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| − | Link to a Muncie page showing | + | 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. |
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| − | [http://www.dandltransmission.com/muncieratio.html Muncie | + | |
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===Saginaw transmissions=== | ===Saginaw transmissions=== | ||
====General Information==== | ====General Information==== | ||
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Saginaw transmissions come in two basic varieties, 3-speed and 4-speed, and have the following characteristics: | Saginaw transmissions come in two basic varieties, 3-speed and 4-speed, and have the following characteristics: | ||
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[[File:Ford_trans.gif]] | [[File:Ford_trans.gif]] | ||
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===Cruise-O-Matic=== | ===Cruise-O-Matic=== | ||
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Introduced in 1951, the Cruise-O-Matic series of three-speed automatics (which includes the FMX) was used in Ford, Lincoln and Mercury passenger cars until 1979, and in light trucks from 1968 through 1979. | Introduced in 1951, the Cruise-O-Matic series of three-speed automatics (which includes the FMX) was used in Ford, Lincoln and Mercury passenger cars until 1979, and in light trucks from 1968 through 1979. | ||
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The Cruise-O-Matic/FMX transmissions are easily identified by their design, which incorporates a cast-iron main case (unlike all other Ford three-speed automatic offerings) with separate aluminum bellhousings and extension housings bolted to it. The Cruise-O-Matic should be avoided in performance applications as very little is available in the way of aftermarket performance parts other than shift kits. The Cruise-O-Matic were also offered with all three bolt-common V8-pattern bellhousings. | The Cruise-O-Matic/FMX transmissions are easily identified by their design, which incorporates a cast-iron main case (unlike all other Ford three-speed automatic offerings) with separate aluminum bellhousings and extension housings bolted to it. The Cruise-O-Matic should be avoided in performance applications as very little is available in the way of aftermarket performance parts other than shift kits. The Cruise-O-Matic were also offered with all three bolt-common V8-pattern bellhousings. | ||
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===C4/C5=== | ===C4/C5=== | ||
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===Three speed=== | ===Three speed=== | ||
[[File:57ODtrans t86 top t85 bott.jpg|thumb|400px|left|T86 top, T85 bottom]] <br style="clear:both"/> | [[File:57ODtrans t86 top t85 bott.jpg|thumb|400px|left|T86 top, T85 bottom]] <br style="clear:both"/> | ||
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=Mopar transmissions= | =Mopar transmissions= | ||
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=AMC/Rambler transmissions= | =AMC/Rambler transmissions= | ||
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Antti-Ville Nauha (Pori, Finland) AMC CLUB FINLAND (AMCCF) long ago compiled this excellent | Antti-Ville Nauha (Pori, Finland) AMC CLUB FINLAND (AMCCF) long ago compiled this excellent | ||
[http://www.gremlinx.com/AMC-Transmissions.htm guide to identifying AMC and Rambler transmissions]. | [http://www.gremlinx.com/AMC-Transmissions.htm guide to identifying AMC and Rambler transmissions]. | ||
| − | http://www.charlietranny.com/AMC.htm | + | [http://www.charlietranny.com/AMC.htm AMC transmissions] |
=Other transmissions= | =Other transmissions= | ||
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=Resources= | =Resources= | ||
| − | + | *[http://www.maliburacing.com/auto_tranny_id.htm GM Automatic Transmission Identification and Information] -- Very helpful identification guide with identification by pan and transmission dimensions. | |
| − | + | *[http://fiedlerh.home.att.net/BW.htm Borg Warner Second Design ST-10 4-Speed Info] -- Codes, applications; a very informative page. | |
| − | + | *[http://pontiacpower.org/BW.htm Borg Warner Second Design ST-10 4-Speed Info] from Pontiac Power. | |
[[Category:Transmission]] | [[Category:Transmission]] | ||
[[Category:Identification and decoding]] | [[Category:Identification and decoding]] | ||
[[Category:Good articles]] | [[Category:Good articles]] | ||
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