Improve the ground clearance and off road capability of your 4 Door Diesel Jeep Wrangler JL with the JKS J-Kontrol 3.5" suspension system. The J-Kontrol system retains your OE control arms, but steps up the rest of your suspension. J-Kontrol kits feature dual rate coil springs, adjustable front track bar, choice of custom valved shock options tailored to your needs, including JSPEC gas shocks, FOX Adventure Series, FOX 2.0 Performance Series, FOX 2.5 Performance Series and FOX 2.5 Elite Series shocks, sway bar Quicker Disconnects, and front control arm correction brackets as well as all other necessary hardware for a complete bolt-on installation. J-Kontrol system's front control arm correction brackets further enhance the on-road handling by flattening out the control arm to more closely mimic factory angles while correcting caster. With a matched combination of parts, J-Kontrol systems offer very solid performance without compromising daily-driver comfort. If you spend a good amount of time on the trails, take control with J-Kontrol.