Converts Super Flex short arm system to Extreme Duty Long Arm system; Front and Rear lower Chromoly long arms along with rear uppers;New PT-Meg Super-Ride bushings, Designed for on and off-road performance;Adjustable control arms with serviceable Super-Flex spherical ball joints;California Residents: WARNING Designed for TJ owners who already have a Rubicon Express Super-Flex short arm suspension system, these kits allow you to upgrade to the Extreme-Duty Long Arm System. Our Extreme-Duty Long Arm System will provide noticeable improvements in your TJs on road handling, returning a nearly stock ride quality. Off road you will see unmatched performance on the most extreme trails. These upgrade systems include a three-piece belly pan for easy transfer case and transmission access. Rear stainless steel brake lines and the Chromoly Rubicon Express Extreme-Duty Long Arms. Lift heights depends on the system you are upgrading.