Designed to replace the original low carbon GM part, the ACG-012 is made from billet 4140 steel and heat treated with the austempering process. Shot peening is included. It allows for increased caster with little or no change in camber, eliminating a fat stack of shims. Journals for pivot bushings have a 3/8"-24 thread in both ends. Normally used with ACG-020 Lower Control Arm Shaft. Spherical bearing and hardware kit is available from ACG Enterprises - 405-634-8656