With a stock rear fender and the tire inside the fender I am running a 15x7 with 3 3/4 backspace and a 235x70xR15 BFG tire. The rear is out of a 4WD S10 Blazer which has the same width as the original 33 rear (it fits on the spring alignment pins). The 4WD rears are wider than the 2WD vehicles.
Stats Of Website