I used Hi-Jacker air shocks in the back of my sagging 01 AWD 4 door X. got the pair from auto zone for 65 bucks with a life time warranty. I was able to gain as much as 5 inches of lift with them alone. So by the time i loaded the back with about 300 pounds of crap and twisted the torsion bars in the front, my 31s clear nicly. No shackles or springs in the back, just the air shocks.