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Thread: 1970 buick gs455 stage 1 4 speed

  1. #1
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    1970 buick gs455 stage 1 4 speed

    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

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    M20 is the code on the paperwork for the M21 transmission. M21 is what you should have.

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    thanks was pretty sure but been a chevy guy most of my life and learning buicks now

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    anybody know where I can get a 1970 3.64 posi rear end for my 70 stage 1?

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    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

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