The Super-Flex Suspension System Is Designed For Enthusiasts Looking For The Best Short Arm Suspension System That Retains The Factory Mounting Locations. The Super-Flex System Features Great Ride Quality And Phenomenal Performance. Features Include New Rubicon Express Adjustable Upper And Fixed Lower Control Arms With Our Serviceable Super-Flex Speherical Ball Joints, Replacement Lift Springs, Extended Bump Stops, Longer Front And Rear Stainless Steel Brake Lines.