Skyjacker 21-24 Jeep Wrangler Rubicon JL 4XE Rear Dual Rate Long Travel Coil Springs - 4in LiftThe biggest determining factors in ride quality and suspension performance are coil springs. 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
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