I'm gonna purchase tires this week and not sure what size to get. I've got my torsion bars cranked with stock keys and an add-a-leaf and coil overs in the rear. I putting on some 15" rallys from a 80's style and was thinking of going to 31x10.50's. A buddy told me I could run 32x11.50's with no issue. Can anyone second his opinon? My tahoe is a 99 4dr 4x4