Need some questions answered first. What is the backspacing on the rims? Some 31s will rub a little bit and some will not at full turn. That is really easy to fix though with a couple washers on your steering stops.
2000 Sahara, 3.5" Rubicon Express Lift, 1" spring spacer & 1" Body Lift, 33" or 35" BFG Mud tires, Front & Rear ARB, Rancho 9000 shocks, UCF Ultra High Belly Up