Re: air locker or no?
Well, for my 2 cents, a factory LSD is fine if you don't plan on doing much off-roading or burnouts! The clutches and springs inside eventually wear out after repeated use! Personally I prefer the Lock-right for both on and off-road use and abuse! It will take more abuse than your stock axles will also. They're around $400 for the new softer-locking type(better for the street)but definetly worth every penny(especially in a 2WD!) As for gears, if you have the 4.3 go with 3.73s for good power/3.42s for economy-less power. If you have the 4 cyl, go 4.10s or 4.56 for max power. That 2.2L needs all the help it can get to turn 31s!
1989 GMC S-15 4x4 4.3L/700R-4, 3.08s, 31" Sport Kings For Sale
1985 S-10 4x4 Soon to have 3504BM/TH350/D44/14FF, 35" Boggers