Body lifts are installed to fit larger tires in a cheaply fashion. If you have a 4" body lift, you can run 33". I highly advise not getting a body lift, as it does nothing for off road. You can leave it if you want, but it would look weird. For 33" tires, you really don't NEED a lift, but your best bet is run a 2.5" suspension lift and if possible, toss the body lift. That will make you great on and off road.