the history i have read says they redesigned the transmission in 1936 to mate with the new 320 engine.cadillac division liked it so well they adopted it with an open drive line from 37 to 50.it also went into the 49 to 55 olds as well as the 55 to 57 pontiac.the gears in them are all the same 2.32 low and 1.53 second.it depends on the application which case is used as the buick is a closed drive line.i think 56 was the last buick stick.
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