The Global West Super Duty Lower Control Arms were developed to compliment the new found cornering abilities of the Global West Negative Roll System. These arms stop deflection at the lower arm bushing location and resist twist through the lower control arm channel. These arms are boxed and modified to accept an aircraft spherical bearing instead of a rubber or polyurethane bushing. Even the most casual observer will note that these lower arms provide far superior suspension control over stock and competitive units. Super Duty arms are strongly recommended when using the Super Duty Negative Roll Upper Control Arms. The kit includes ball joints, as well as associated installation hardware.