Chevy Manual Transmission Identification
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Muncie (left) Saginaw (center) Borg Warner (right)
The muncie reverse lever is in the extention housing, and the cover has 7 bolts.
The Saginaw reverse shift lever is on the cover, and the cover has 7 bolts.
The Borg Warner has a 9 bolt cover.
Muncies are the hot tip, since they usually were used with high performance engines. Again on the muncie, and looking at the cover, 3rd/4th gear lever is on the left. 1st/2nd gear lever is on the right.
Further Muncie identification
The close ratio gearboxs generally came with 3.73+ gear ratio'ed cars. 3.55 geared and higher (numerically lower) cars used the wide ratio gearbox.
Due to the wide combination of id's, stampings, numbers, etc... varied and even GM couldn't keep track of what was what, it's best to ID your gearbox visually, taking what is stamped on the box FWIW. The best way to ID the transmission is to count teeth.
|M20: 1963 - 65||10||none||24||29-22-19-17||27||Note 1|
|M20: 1966 - 70||10||2||21||25-22-19-17||27||Note 2|
|M20: 1971 - 74||26||2||21||25-22-19-17||32||Note 2|
|M21: 1963 - 70||10||1||26||27-22-19-17||27||Note 3|
|M21: 1971 - 74||26||1||26||27-22-19-17||32||Note 3|
|M22: 1965 - 70||10||none||26||27-22-19-17||27||Note 3|
|M22: 1971 - 72||26||none||26||27-22-19-17||32||Note 3|
Effective October 21, 1968, an additional letter was added to the plant prefix number to help identify the gear ratios in Muncie transmissions. The additional letter codes as follows:
|Muncie 3 speed Manual||Muncie 4 speed manual transmissions|
Of course like engines, transmissions come and go over time, so below is the (as complete as I can make it) transmission plant prefix list:
|Cleveland||Turbo Hydramatic||B||Warner Gear||3 & 4 speed||P|
|Hydramatic||Turbo Hydramatic||CA||Muncie||4 speed||R|
|Muncie||3 speed||H||Saginaw||3 speed||S|
|GM of Canada||Turbo Hydramatic||L||Cleveland||Turbo Hydramatic||X|
|Muncie||3 speed and Overdrive||M||Toledo||Turbo Hydramatic||Y|
Author: MadMike Maciolek
North Georgia Classic Camaro
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