my question is i have a 4.5 RE short arm kit now on my XJ and wanting to know how much of a coil spacer can i run in the front before it messes with anything and what will it effect? i am installing a winch and bumper next week and want to level it back out once it settles. also i have 3.5 rear leafs and 1" shackles. what can i do to go up another 1" in the rear if needed? thanks for the advice