This new system include heavy duty 1/4in thick steel lower control arm crossmembers with an integrated front differential skid plate for protection and increased front suspension strength. This is an important construction feature to properly handle large tires on and offroad. Fabtech's extended length ductile iron steering knuckles allow use of 18in, 20in or 22in wheels Estimated installation time - 5 hrs. Zero holes to drill for installation. No welding required. Some cutting required. No driveshaft modification required.