ReadyLIFT offers a leveling kit designed for 2011-2019 GM 2500/3500 HD trucks, featuring forged torsion keys and heavy-duty fabricated steel upper control arms. This kit is renowned for its strength and safety, making it the top choice for leveling the GM 2500/3500HD platform. It includes ultra-strong fabricated boxed upper control arms with 1-ton ball joints, providing an excellent leveling solution at an affordable price. The ReadyLIFT 44-3100 Extreme-Duty Upper Control Arms are constructed from laser-cut and CNC-bent .125 4130 chromoly plate steel, ensuring exceptional durability for trucks with 0"-8" of lift. The pivotal points are maintenance-free, featuring 1-ton spring-loaded HD series ball joints that maintain the factory driving experience, even under the weight of heavy aftermarket wheels and tires. To enhance longevity, CNC machined billet aluminum caps protect the ball joints from road debris. The frame side pivots incorporate innovative TCT bushings, self-lubricating and designed to last. These bushings include "side biter" washers to aid in alignment maintenance. The free-floating bushing design eliminates friction, a common cause of traditional bushing failure. Each ReadyLIFT Extreme-Duty Upper Control Arm boasts a rugged Anthracite Gray powder coat finish and a stainless steel ReadyLIFT brand arm badge, setting new standards for upper control arms. This kit is compatible with 2011-UP GM 2500/3500HD trucks with 0"-8" of front lift. It comes with durable Grade 8 hardware, and installation requires no modifications. Note: Lift height must not exceed 26.25" for 4WD and 27" for 2WD vehicles when measured from the center of the wheel to the fender lip above the 12 o'clock position.