I have a 1995 chevy k1500. It has a 10 bolt rear and the stock gears (3.73?), I re done a lot of stuff in this truck, new plugs, wires, cap, rotor, air filter, (flipped air lid), synthetic oil, TBI spacer, and a new EGR valvce. The TB was cleaned and the truck runs like a dream. I couldn't ask...