dependin on the jeep, any jeep you can basically raise 3 inches and fit 31's and 33's if ya feel like trimming. though if you go any bigger than that you might have to watch your size of tires, cus if ya 6 inches of lift and 35-37's on a dang ole grand cherokee with weak D35 axles, then your gonna break them a bunch. jus keep that in mind. Do research and ask questions and stuff. also shop around a bunch, i found a good deal on my lift for 525 when it retails from RE itself at 880, though at the time like 800. what surprised me the most, is that my set up or what not , whoops the crap out of my friends 4rnr which has 33 Dunlop mud rovers, and 4.5" lift. maybe its the driver, or maybe the tcase, but I dunno, guess its just one of those jeep things.