3" IRO foundation lift is what I'm running and have been happy with it. For around $550 you get 3" taller springs, new shocks, adj. Track bar and rear sway bar links. Decent kit for the money but you will want to change a few other parts when you lift. I would suggest new spring insulators, HD steering stabilizer and check all the bushings in the control arms. Also when you lift the WJ's they like to wander a bit due to the rear sway bar being tiny, Addco offers an HD setup if you don't like the wobbly feeling of it lifted. At 3" lift with minor trimming you can clear a 265/70R17, roughly 32"x10.5. With lots of trimming I can clear a 33x12.5 but rub at full lock in front.