Well I had a professional shope here in Houston set mine up for me. I bought the rebuild kit from Indy 4x and they replaced all of that for me, yet not even a year later the gear mesh is terrible and it sounds like a tank in the rear end everytime you let off the gas. Mine was setup good initially but it seems something over a few months of driving has gone wrong and I need to take out the rear 4.78 gears and have them shimmed or even rebuilt again