2.56 rear to 3.08
Buddy has a 76 GP with a dead 2.56 rear. Will he see much of an improvement in off the line performance with a change to a 3.08 rear? He knows he will lose a little gas mileage. Will his speedometer be off then? Is it hard to change the speedometer gear in an automatic tranny? Thanks.
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73 Grand Am 455 Muncie M20 4 speed 3.23 gears
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