[blackedoutharley]

Remember that everything is combined to work together; engine and its torque output (which is related to size, camshaft, compression etc), transmission, clutch, rear gearing & overall tire diameter.

If one thing is out it will make the overall results less than admirable. I would probably just go to a larger tire. I assume we are talking about the truck in your profile picture... If so, you might try installing a taller tire first. 31X10.50R15 is a good size that, depending on what wheels you have on the truck, is a great fit.