A833 in a Buick? There is an A833 manual that is a 3.09 first and .73 overdrive for sale here. It says it has a Buick bellhousing. I'm wondering if this will fit in my 71 350 4 speed and 3.08 rear with minimal change? I'd settle for an M20 to replace the M21 but if I do that I don't want to change clutch or drive shaft and I have the later M21 which is fine spline input and large output shaft. I find lots of M20s but they are all course input shaft and small output shaft. About all I can find is this is a truck transmission from 2WD manuals in the 80s. Anyone have experience with these? Will it survive behind a stock 71 350?