1" body lift for 1987-2006 Jeep YJ and TJ Wranglers, as well as LJ Unlimiteds allows for additional tall tire clearance without exceeding practical suspension lift heights. The RockJock billet aluminum body lift pucks are concave on the bottom side to allow the retention of the stock rubber body mounting pucks. This keeps the body isolated from the frame just like stock, so that no more noise or vibration will be transferred to the cab of the vehicle than would be stock. The aluminum pucks are powder coated black for durability, and all of the necessary new longer grade 8 body bolts are included in the kit. We highly recommend the use of the 1" raised heavy duty motor mount kit in conjunction with this body lift to keep all of your underhood and linkage pieces in line with the body where they belong. On a vehicle with a 4" lift and 33" tires, you can install the body lift and motor mount lift and efficiently clear 35" tires.