The biggest determining factors in ride quality and suspension performance are coil springs and shocks. Skyjacker specifically engineered a progressive 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. Engineered to coordinate with the Wranglers distinctive suspension handling characteristics, the rear coils are side specific. Shocks are a key link in-between the chassis and your suspension. Their key role is to dampen out or control the terrain to keep your tires in contact with the terrain. Front damper capacity enhanced with Black MAX Shocks. Black MAX Shocks have specific valving and stroke for this application. Black MAXs Advanced Foam-Cell technology increases performance and style to deliver a smooth, comfortable ride. The replacement Front Adjustable Track Bar includes Skyjacker installed pressed-in HD OEM style rubber bushing and an adjustable 3/4-inch Heavy-Duty Rod End, Jam Nut and Alignment Bushings. 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). These sway bar end links include Skyjacker installed pressed-in HD OEM style rubber bushings.. Skyjacker 21-23 Jeep Wrangler JL Rubicon 4XE 4 Dr LT 3.75in Coil Sys w/ Black MAX Shocks. Black MAX Has Nitrogen Gas Charged / Twin-Tube Construction. More Aggressive Off-Road Stance With Comfort And Stability. Flex Stage / Ride Stage Dual Rate Long Travel Coil Springs. Extended Length Sway Bar End Links Allow Full Articulation. Aggressive Look; Unparalleled Performance; Impressive Ride. Black MAX Valve Tuned Specific With 30 Percent More Fluid. Works With OEM Electronic Stability Control [ESC] System. Black MAX Engineered With Advanced Foam-cell Technology. Black MAX Shocks Have 360 Degrees Arc-welded End Mounts. Straight Bolt-On; Direct Fit; Simple Remove and Replace. Drives Like A Performance Handling Suspension Package. Engineered To Maintain Proper OEM Suspension Geometry. JL 4XE RUBICON 3.75in. W/BLKM. Suspension Lift Kit w/Shock. Lift Kit-Suspension

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