If you're looking at doing a rearend swap and keeping the original drivetrain... One of the simplest options is to go with a six lug rear. The 03-12 Chevy Colorado had a 6 lug rear. You'll want to stick with the 4x4 or Z85 rears, they're slighter wider and fit the AD trucks better. They have gear ratios from 3.08 to 4.11.
Another option is the 95-2004 Toyota Tacoma 4x4 and Prerunner rearends. They have ratios from 3.15 to 4.56.
If you go the 6 lug route, you'll probably then want to swap out your front axle from a 47-54 3100 truck also.
You could also find an 8 lug Chevy full float 14 bolt rearend. The 63" model is what you want, but is getting pretty rare. They had 3.21 and 3.42 geared models, but more than likely all you're going to find is 4.11, 4.56, and 3,73 rears.
No matter what route you go there's going to be some hacking, fabbing, and welding.
Last edited by Whitedog; 02/23/2022 12:30 AM.
