Performance Shock Absorber - Precision Engineered for Street and Off-Road Performance. Can accommodate Lifted Suspensions 0-1.5". Monotube-High Pressure Design Heavy Duty 46mm Piston Nitro Coated Shaft. Durable Zinc Coated Weather Resistant Shock Bodies. Made in U.S.A. Limited Lifetime Warranty Download the Installation Guides: Eibach Installation File #1 Compatible Vehicles Year 2014-2018 Make CHEVROLET/GMC Model Silverado/Sierra 15004WD/2WD Front +1.75-4.0" Forged aluminum forged Steel or upgraded aftermarket control arms highly recommended for trucks equipped with stamped steel control arms from the factory.