This 4" JK system offers dramatic improvement in both ground clearance as well as wheel travel. With 4" of lift, you can clear those 35's with tons of room to twist as well as use your Jeep for a daily driver. Zone coil springs are designed so they can be totally smashed flat and still return to their original height, so you don't have to worry about your coils sagging! A heavy duty adjustable front track bar is included with durometer specific urethane bushings as well as a rear track bar relocation system. Unique to Zone, this system comes with front cam locks to increase caster and ensure good handling characteristics. These cam locks are guaranteed not to slip out of position like other adjustable round cam designs can.