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Rubicon Express Extreme-Duty Long Arm Radius Lift Kit is the first radius long arm suspension kit designed for 2007-2018 Jeep JK. This lift kit keeps the pinion and driveshaft angles in proper phase to eliminate suspension jacking and unwanted suspension squat. Included in this kit are chromoly radius arms, PT-Meg Super-Ride bushings, adjustable control arms with Super-Flex spherical ball joints, and tuned springs.