XJ Drive, Call Quadratech and see what they tell you first, if they don't resolve your issue you can run longer shackles or lift blocks. How old are your shocks? If they are shot, it will cause your leaves to wear prematurely; my jeep leans to one corner because I destroyed a rear shock on a week long overland trip. Also, the shackle thing is a myth now.
88 XJ-Dana 44s, Detroit Locker, Rusty's 4.5" coils, bastart pack, Rusty's LA, 37/12.5 Maxxis Creepy Crawlers
69 CJ5-In peices