Like Chud said, be aware of binding that can occur with the additional lift. I hate to generalize on this one, as all units are different, but I find it best practice to not go over 2" of lift. Anything over that, 3" and up, can cause your axles to bind and prematurely wear. Limiting straps will correct this, but they also need to be installed properly, and it can get very expensive in a hurry for only an extra inch of ground clearance.