This will be my next mod: 1" body lift + 1" motor mount lift + 33 eng. aluminum skid. I'm told that there are no changes required to the exahust. You may also need adjustable upper control arms and a SYE / CV driveshaft depending on the amount of lift you end up running.
There is a good write-up here:
Hey Mods: Please move this thread to the TJ forum.