I've got a 30" tall tire in the back now, and I'm running 2.73 gears with an auto 700R4, I want to accelerate quick, but I'm not sure about what all gears are good for what in the rear, all I know is I am not happy with the rear gears in there now, I cant even chirp the tires, and the truck just doesn't accelerate quick at all, even on the freeway!