Since those are 30-1/2 inch tires you might come close to rubbing on the front edge of the rear part of the front fenders. The fact the wheels stick out a bit more than 4wd wheels will contribute to that some. You might have to tweek your torsion bars a bit. Don't get carried away because the more you raise it the harsher the ride and more wear of steering and suspension components. I've used a dead blow hammer to fold over the very bottom edge to eliminate rubbing. Not something I'd recommend for a cherry truck, but most 4wd's are not show trucks and it's barely noticeable if done carefully. Running the rear Irocs on the front with the additional backspacing might help also. IIRC stock 4wd back spacing is 6".