For sale is a used GM Saginaw 4-speed manual transmission. The main housing casting number is 3925656 indicating late 60s to early 70s manufacture, the tail housing is 3873886 which indicates Camaro. The VIN sted in the pad is 12B575634 which indicates it came out of a 1972 car. This trans has one line around the input shaft indicating a 2.54 first gear ratio.This trans came out of a shop I bou...