tires and a leveling kit
 

I've got 285/70/17s on now and i just bought a 2.5in leveling kit. Whats the biggest tire I can go with, or where could I find this out? I dont go balls out 4x4ing with it, but it is in the field from time to time.

ive heard 35x12.5x17 i run a 305x70x17 with no leveling and dont rub at all

hmm, ok !!!

315/70-17 or 35/12.50-17. I'm running 315's w/o a lift or leveling kit, no problem.

I've seen 37's on a 2" leveling kit, but Its a bit too close for comfort for me.. although the 35's I have on my STOCK truck seem to clear fine.

You probably already got tires by now but I'll add in. I have 35s with a 2" leveling kit and when they went on it rubbed. not much, but had to do some trimming to the inner fender. But I also have aftermarket wheels with a 4.5" backspacing. Which may be the issue. 5.5" Backspacing may have cleared them. Also if you have stock wheels 37s will balloon a lot, 35s may also. 33s I know would have cleared on mine. But 35s look awesome on a stock ht or leveled truck.