Skyjacker 4" CUMMINS DIESEL SYS W/6"RSkyjacker Suspensions suspension lift kits provide a smooth, comfortable ride, while responding to on or off road conditions. They help you get the right height, clearance, and attitude on your truck and maintain that factory ride quality, while improving handling. They come with all of the necessary mounting hardware and detailed instructions, and are available for 2WD or 4WD vehicles.