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1940 transmission

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I have a '40 Pontiac Torpedo coupe. It's built off a GM c-body chassis which is shared with other GM divisions. The car is not modified and has the 3-spd manual.  Is the 3 spd transmission shared with other makes from GM at the time?  My thinking is that this trans was a generic GM trans and any division that opted to use it in their models could change the gear ratios to suit the rest of the driveline but the case, the tail, and a lot of internal parts and seals were the same regardless of the GM brand.


Does my thinking make sense?


Any help on this would be appreciated,


Edited by deac (see edit history)
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