Supreme Suspensions - 3" + 1.5" GMC/Chevy 2500HD 3500HD 4WD 4x4 w/ Shock Extenders PRO Our products come with a Lifetime Warranty and are backed by our 100% Satisfaction Guarantee or your money back Max-Torsion Key Lift Kits are engineered with twice the strength of the factory system Installation instructions included, easy to install, no welding or cutting required Fits 2011-2014 GMC Sierra 2500HD 3500HD 4WD & 2011-2014 Chevy Silverado 2500HD 3500HD 4WD Same day shipping if payment is received by Monday-Friday before 2PM Pacific