Right now we got a 28 tire going 135 mph, but turning 7400-7500 through the traps. Would like to be at 7000, and the math says a 4.30. I'm thinking real world might not be 500 rpm, so considering 4.10. Thoughts? Also in back of my mind is a 4.30 gear set has 43 teeth, so stuffing an extra 2 teeth would result in a weaker gear set, car has a 1.30-1.34 60'.