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i have a 96 4x4 and my 31 10.5 r15's fit in no problem. I have had no problems with rubbing or anything, but i did raise it about an inch using the torsion bars.
I also have a 96 4x4 and I've got 31 inchers on it, but I didn't raise mine. It's still stock height. I don't think you'll have any problems, because I haven't yet.
I have a 93 I have 33 bfgr AT 12.5r15 they rub only a little like a 1/4 of an inch or so. I did put a 2 in body lift on it.(only $94) Better than any 31's