Quote:
Originally Posted by 31ROC
So, doing a search for M20...and most ads are saying their M20 should fit 67-70's Chevrolet.....if I have a mid to late 70's 350, will this tranny fit?
Also.....will the M20 have the correct spline counts input and output?
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The tranny mates to the bellhousing and yes, the same bellhousing that fits the earlier blocks will fit your block. Put another way, any M20 will work, but it takes a bellhousing to connect the tranny and engine together.
The M20 can come from any GM vehicle, mine is from a Pontiac for example. So don't pass one up just because it doesn't say it's for a Chevy.
The input splines will determine the clutch you use, so there's no problem there. Older trannys (1962-'70) used the 10 spline input, newer trannys (1970-'74) used a 26 spline input. But you can get a clutch for either spline that will work for you. It's the output shaft spline count that can mean a different drive shaft yoke is needed or not.
The earlier M20 output shaft has 27 splines- the same spline as the tranny you have now. Or it can have a 32 spline output, this was used on the newer trannys.
You will need to install a
pilot bushing in the crankshaft, this is what locates and supports the end of the input shaft.