widest wheel size in rear of stock gen 3 s-10

Yeah there were only ever 2 body styles. I've never heard of the 98+ referred to as Gen 3s before. I'm assuming you have a 2nd gen. Ther was a guy here running 20x10 Coys with a 6" drop in the rear. He sold em to another guy with an SD 5 link. Its close but they fit both trucks without much issue. just get the proper offset.

if your making a track car, is it JUST for the track? If so....why not 4 link it on some coil overs and shorten the rear to shove some fat tires out back? 10.5 isnt THAT wide...