Re: 4.56 gears
randys ring and pinion is good stuff. if you want strength send them off to get kryogenically frozen, i have heard a lot of good things about that making the weaker components stronger.
99 extended cab, 4.0, auto, 33s, 4x4 lifted with some stuff done
98 2wd 2.5, 5 speed, dropped with some stuff done