2011-2019 GM HD 5-6" MAX 2.1 Lift Kit w/ Falcon Shocks (42-31540)The ReadyLIFT 5 inch to 6 inch MAX 2. 1 Suspension System is a performance game changer for 2011 2019 Chevy Silverado and GMC Sierra 2500 3500 HD trucks. This system is designed to improve stance, performance, and capability while providing a better than factory feel thanks to the vehicle specific performance tuned Falcon 2. 1 monotube dampers on all four corners. The kit provides adjustable lift from 5 inches to 6 inches, making it ideal for daily