Transmission identification
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The purpose and function of this page is to acquaint people with the identification of popular North American made 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. | The purpose and function of this page is to acquaint people with the identification of popular North American made 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. | ||
| − | + | =GM transmissions= | |
| − | + | ==Automatic== | |
A dual pattern bellhousing bolt pattern was used on a couple different GM automatics. | A dual pattern bellhousing bolt pattern was used on a couple different GM automatics. | ||
[[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"/> | ||
| − | + | ===TH350=== | |
The GM Turbo Hydra-Matic 350 transmission (aka "350", "TH350", "Turbo 350", etc.) was used between 1968-'86 in RWD and 4WD GM vehicles. It is a relatively rugged, compact transmission that lends itself to a wide variety of applications and modifications. | The GM Turbo Hydra-Matic 350 transmission (aka "350", "TH350", "Turbo 350", etc.) was used between 1968-'86 in RWD and 4WD GM vehicles. It is a relatively rugged, compact transmission that lends itself to a wide variety of applications and modifications. | ||
| − | + | ====TH350 transmission ID==== | |
{| | {| | ||
|[[File:TH350 ID governor cover.jpg|frame|left|ID stamped into governor cover]] | |[[File:TH350 ID governor cover.jpg|frame|left|ID stamped into governor cover]] | ||
|} | |} | ||
| − | + | ====TH350 dimensions and tailshaft (extension housing) lengths==== | |
[[File:TH350 dimensions.jpg|thumb|left|400px|]] <br style="clear:both"/> | [[File:TH350 dimensions.jpg|thumb|left|400px|]] <br style="clear:both"/> | ||
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[[File:3504WD output.jpg]] | [[File:3504WD output.jpg]] | ||
| − | + | ====TH350C==== | |
There was also a TH350'''C''' version that has a lockup torque converter (TCC). The case has a "C" cast into it, and there will be an electrical plug adjacent to the shifter shaft on the driver side of the tranny. Not to be confused with a TH350 non-lockup tranny with a screwed-in electrical connector on the ''passenger'' side of the case. This is a pressure switch that was used ~1972-'73 for the Transmission Controlled Spark (TCS) system. This disabled the distributor vacuum advance in all gears except high gear, and is a single wire switch threaded into a pressure port near where the cooler lines are located. In the case of this switch, you can either leave it in place, unused- or remove it and plug the port. There have been reports of some TH350 trannys having a temp sender in this area as well. | There was also a TH350'''C''' version that has a lockup torque converter (TCC). The case has a "C" cast into it, and there will be an electrical plug adjacent to the shifter shaft on the driver side of the tranny. Not to be confused with a TH350 non-lockup tranny with a screwed-in electrical connector on the ''passenger'' side of the case. This is a pressure switch that was used ~1972-'73 for the Transmission Controlled Spark (TCS) system. This disabled the distributor vacuum advance in all gears except high gear, and is a single wire switch threaded into a pressure port near where the cooler lines are located. In the case of this switch, you can either leave it in place, unused- or remove it and plug the port. There have been reports of some TH350 trannys having a temp sender in this area as well. | ||
| − | + | ====TH250C==== | |
The TH250 looks almost identical to the TH350 externally- same size, same oil pan. Unlike the TH350, it has a band adjuster stud and lock nut on the passenger side of the case near the cooler lines. Be careful to not be fooled into thinking a TH250 is a TH350. | The TH250 looks almost identical to the TH350 externally- same size, same oil pan. Unlike the TH350, it has a band adjuster stud and lock nut on the passenger side of the case near the cooler lines. Be careful to not be fooled into thinking a TH250 is a TH350. | ||
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| − | + | ===TH250, TH250C, TH350, TH350C, TH375B transmissions=== | |
| − | + | ====Identifying transmissions in the TH350 family.==== | |
{| style="background:yellow" | {| style="background:yellow" | ||
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1973-'85 Chevy and GMC 2WD and 4WD pickups, Blazers, G-10, G-20 vans and Suburbans | 1973-'85 Chevy and GMC 2WD and 4WD pickups, Blazers, G-10, G-20 vans and Suburbans | ||
| − | + | ===TH200, TH2004R transmissions=== | |
| − | + | ====Identifying transmissions in the TH200 family==== | |
Photo of a multi-pattern bell housing of a TH2004R | Photo of a multi-pattern bell housing of a TH2004R | ||
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| − | + | ===TH700R4, 4L60 transmissions=== | |
| − | + | ====Identifying transmissions in the TH700R4 family==== | |
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[[File:TH700-R4_ID.jpg]] | [[File:TH700-R4_ID.jpg]] | ||
| − | + | ==Manual transmissions== | |
| − | + | ===General Information=== | |
| − | + | ====Bell housing bolt pattern and measurements==== | |
[[File:9020Bellhousing_Bolt_Pattern.jpg]] | [[File:9020Bellhousing_Bolt_Pattern.jpg]] | ||
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| − | + | ===Muncie M20, M21, M22 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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| − | + | ===Saginaw transmissions=== | |
| − | + | ====Saginaw 4-speed transmission==== | |
| − | + | ====Cast iron case==== | |
3 shift levers on side cover | 3 shift levers on side cover | ||
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