I am curious to see what it does. I have heard of guys with 500 strokers dropping from 4.10's to like 3.55's and going just as fast. I honestly think my 63 may go faster if I drop a little gear. I think I am above my peak torque at the traps and have been thinking of dropping my 4.30's to about 3.91's. But I do run a 30" tall tire. You may not loose much if any Tony. Keep us posted on how it goes because I want to know. Ron