Jeep engineers developed mid-length control arms for JK models for better articulation and improved ride quality. Rock Krawler pushed this concept to the extreme with their bolt-on X-Factor mid arm suspension lift kits. They feature double adjustable 1.5 in. solid alloy steel track bars with anti-wobble joints, multi-rate long-travel coil springs, longer stainless steel brake lines, and an easy aligning front upper arm that's adjustable from inside the vehicle.For improved ride and suspension dampening, Rock Krawler uses their aluminum bodied rebuildable 2 in. RRD spec'd Prodigy shocks with 3/4 in. shafts. Pro sway bar disconnects and extended links combine for steadfast highway drives and wicked off-road flex. For all your incredible journeys, install the Rock Krawler X-Factor Stage 1 mid arm suspension lift kit designed for your vehicle application.Additional features:* High-clearance adjustable lower 1.625 in. and upper 1.25 in. control arms made from solid alloy steel* Rear axle can be moved back up to 1 in. for clearance