Stage 2 system featuring Pro-Truck-Coilover 2.0's + Rear Sport Shocks Front Adjustable Threaded Spring Perch to Accommodate Increased Loads and Maximum Clearance. ERO Off-Road Race Spring Equipped and Compatible. Anodized 6061-T6 Billet Aluminum Coilover Mounts 46mm Piston Monotube Design with Nitrogen Filled Variable Force Valving. Individually Dyno Tested for Matched Performance and Reliability. Heavy Duty Bushing System also Cycle Tested. Engineered Tested and Manufactured by Eibach in the U.S.A. Limited Lifetime Warranty Compatible Vehicles Year 2014 to 2018 Make CHEVROLET/GMC Model Silverado/Sierra 1500 Front +1.75-4.0" Rear +0-1.5" Forged aluminum forged Steel or upgraded aftermarket control arms highly recommended for trucks equipped with stamped steel control arms from the factory. Parts Included PRO-TRUCK Coilover (Front) E86-23-032-01-20 PRO-TRUCK SPORT SHOCK (Rear) E60-23-005-06-01 Download the Installation Guides: Eibach Installation File #1 Eibach Installation File #2