Upgrade worn ball joints on your SPC Performance Adjustable Upper Control Arms with these redesigned joints. Designed, engineered, and tested in Colorado, these completely redesigned, heavy duty ball joints feature: *A new Grease able design *Anew hybrid 2-piece race and internal spring compensate for wear and maintain turning torque and OE lash requirements for life of vehicle. *A massive 36mm ball that is highly polished and coated with electroless-nickel to provide a hard, smooth wearsurface for life of vehicle. *Sealed boots to retain grease and protect from the elements *80 degrees of joint articulation to maximize drop travel without bind These ball joints are a direct replacement for the original joints that came with many of our Toyota and Nissan truck upper control arm sets. Use SPC number 25001 for replacing ball joints on our 25460, 25470, 25485, 25660, and 25540 control arm sets. These ball joint sets are sold in pairs, so only one kit should be needed per vehicle.