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Maybe he wants a lower first gear and doesn't want to change his rear.
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You are correct, I really like the M20 gearset in the SS with a 331 posi and since my Z/28 needs new sequencers(Sp?) I was going to put the M20 low 1st gear in, coupled with the 4.11 posi rear it may be a little quicker...Im currently running an LT-1 with 11-1 pistons, worked 202 heads, chevy off road cam, edelbrock tm1 manifold,holly 780 carb,Unilight ignition, Alumicoat headers and 4.11's...anyone try a combo like this and see the difference? I was thinking of 456 gears but the tranny change will make the difference...I decided that I will never sell this car so having pure originality really wont matter..Maybe I will just put the tranny away and build the one I want to try...