32s or less. if you body lift it you can stuff 33s in it, my 33s with maxed bars and 3 inch body lift fit fine other than a bit of rubbing on the frame, but thats a back spacing issue.

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99 extended cab, 4.0, auto, 33s, 4x4 lifted with some stuff done

98 2wd 2.5, 5 speed, dropped with some stuff done