Your truck should have a HO52 rear end with 4.57 gears. If you stick with the 4 speed, you could go with a 14 bolt with 3.73 or 3.42 gears. Much depends on your tire size. If you will be doing a lot of highway driving consider a 700R4 automatic, OD is .70. With that you could use rear gears of 4.10, 3.90 or 3.73 depending on you tire size and the power band of the engine. Again, the 14 bolt corporate rear. Your best friend will be the old man at the junkyard.
