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I just purchased a 70 stage 1 4 speed car without a/c- supposed to have 3.64 posi but rearend missing along with original Muncie trans- my sloan paperwork says M20 , shouldn't it be an M21 close ratio? or were both trans available? seems like the M20 would be a very steep first gear with a 3.64. any help would be great as im just learning the buick thing. thanks
M20 is the code on the paperwork for the M21 transmission. M21 is what you should have.
thanks was pretty sure but been a chevy guy most of my life and learning buicks now
anybody know where I can get a 1970 3.64 posi rear end for my 70 stage 1?
One for sale here:
http://www.v8buick.com/index.php?thr...o-drum.339134/
Complete rear out of a 70 STG 1 non air car, 3.64 with posi .
$1250.00
Pick up near Baltimore Md