KSP upper control arms for 2011–2019 Chevy Silverado 2500, Silverado 2500HD, Silverado 3500, Silverado 3500HD, GMC Sierra 2500, Sierra 2500HD, Sierra 3500, and Sierra 3500HD are designed for trucks with 2–4 inches of front lift to help restore suspension geometry and improve front-end control on lifted applications. These arms reposition the ball joint to better match the operating angle created by added ride height, which can help improve caster and alignment range compared with stock arms on a lifted setup. This design may also help support smoother suspension travel and more predictable steering response. The tubular arm body is built from 1.25-inch OD, 0.120-wall DOM steel tubing for strength and long-term durability in daily driving, towing, and off-road use. Greaseable ball joints and bushings help support easier maintenance, while pre-greased ball joints and included silicone-based lubricant for the bushings can help simplify installation and service. Replaceable wear components help extend the useful life of the assembly over time. This kit includes a pair of upper control arms and is intended for lifted suspensions in the 2–4 inch range. Professional installation and alignment are recommended after installation. Please verify your vehicle year, model, and current suspension setup before purchase.