ProComp 4.0" Rear Block kit for 1999-2010 Ford Super Duty trucks comes complete with vehicle specific heavy-duty u-bolts and hardware. Factory style construction includes integrated bump stop landings and location pins. Adds a nice rake for towing or hauling additional weight in the bed. Easy to install. Does not require any permanent modifications. Note: Block is 4" tall. Amount of lift provided depends on the size of the factory block you remove. For use on trucks with rear leaf springs and blocks with a ONE-piece driveshaft only. Includes taper blocks.