The Skyjacker 4-inch long-travel lift kit component box is specified for the 2018-2022 Jeep Wrangler 4WD. It holds parts that complement the lift of the matching Skyjacker suspension lift kit rather than the whole kit.

Part number: JL40BLT

Skyjacker leveling system.

Skyjacker specifically engineered a progressive variable rate coil spring, distinctively a 2-stage dual rate long travel coil. Spring rate progression is from a 1st Flex Rate to a 2nd Ride Rate. The 1st Flex Rate stage delivers a comfortable ride with the ability to flex for increased articulation. The flex rate expands during full articulation as the suspension drops (full droop). This keeps the coil springs seated in the upper coil mount/bucket and the tires in contact with the terrain. The 2nd Ride Rate stage only engages after compression past the flex rate. A heavy duty Rear Track Bar Upper Mount Bracket is included to center the axle under the vehicle properly. Front and Rear Bump Stop Spacers bolt onto the axle bump pads and keep the suspension travel safely in check. Front and Rear Extended Length Sway Bar End Links allow full articulation as the suspension drops (full droop). Proper suspension geometry ensures the Electronic Stability Control (ESC) system functions within factory parameters.