CB Engineering - Jeep WK / XK Grand Cherokee / Commander Rear Lower Control Long Arm Kit. This kit is designed to remove the stock lower control arm and replace it with a long arm kit allow increase suspension travel. This kit is designed for 4"-8" lift kits. The short rear control arms prevent articulation and suspension travel. The short arms cause the axle to pivot in a small radius limiting droop travel and putting the tire close to the fenders during suspension travel. These long arms are made from heavy wall DOM tubing with our polyurethane bushings with custom stainless steel sleeves and 2.5" Johnny Joints. The body mounts are made from 3/16" plate steel with overlays to create a very strong and functional mount. We recommend using the frame stiffeners with this kit when using them for heavy duty off road abuse as the stock frame channel is thin sheet metal and prone to fatigue. These can be upgraded to Johnny Joints on both ends.