The ReadyLIFT 44-3100 Extreme-Duty Upper Control Arms for 2011-2019 GM 2500/3500 HD trucks feature a time-tested fabricated steel design using .125 4130 chromoly plate steel. These precision-crafted arms are suitable for lifted trucks with 2"-8" of lift from qualified ReadyLIFT lift kits. They come with maintenance-free and exceptionally durable critical pivot points. The 1-ton spring-loaded HD series ball joints maintain the factory driving experience and withstand heavy aftermarket wheels and tires. CNC machined billet aluminum caps protect the ball joints from road debris, extending their lifespan. The frame side pivots incorporate ReadyLIFT's proprietary TCT bushings, which are self-lubricating and long-lasting, including "side biter" washers for alignment maintenance. The free-floating bushing design eliminates friction, a common cause of traditional bushing failure. Each Upper Control Arm is finished in rugged Anthracite Gray powder coat and features a stainless steel ReadyLIFT brand arm badge, setting new standards for upper control arm expectations. Please note that these arms are not for use on stock ride height trucks or with 5-6" lift kits 44-3050 or 44-3052. They offer several benefits, including the correct ball joint pivot angle for lifted or leveled applications, a tab and slot boxed 4130 chromoly plate steel design for increased strength, stronger and longer-lasting outer and inner pivots, and a new heavy-duty spring-loaded ball joint for maximum durability. The ReadyLIFT TCT (Terrain Control Technology) pivots are maintenance-free and self-lubricating, featuring a "free float" inner bushing with "side biter" washers. These control arms can be used on 2011-2019 GM 2500/3500HD trucks with 2"-8" of front lift from qualified ReadyLIFT lift kits, but they are not compatible with stock ride height trucks. They come with a tough Anthracite Gray powder coat finish, durable Grade 8 hardware, and require no major modifications to install.