All those leveling or 2.5" kits do is relocate your shocks, give you re-indexed keys to crank your torsion bars, and some sort of block or AAL to level the rear. They're a marketing gimmick. All you need to do that for free is to crank your stock bars to 1.5"-2" (this is safe), get an alignment and lift the rear accordingly.
Of course, you don't really need any of that to clear the 33's.... especially if you use stock wheels.
Of course, you don't really need any of that to clear the 33's.... especially if you use stock wheels.