LoadLifter 5000 Leaf Spring Leveling Kit Fits 2011 to 2013 GM 2500 and 3500;LoadLifter 5000; Leaf Spring Leveling Kit; Rear; Installation Time- 1.5 Hour Or Less CHEVROLET GMC SIERRA 2500 HD SIERRA 3500 HD SILVERADO 2500 HD SILVERADO 3500 HD BASE DENALI HIGH COUNTRY LT LTZ SLE SLT WT 2011 2012 2013 2014 2015 2016 6.6L Duramax Turbo Diesel LGH (403) 6.6L Duramax Turbo Diesel LML (400) 6.6L Duramax Turbo Diesel LML (403) 6L GEN IV CNG LC8 Vortec (364) 6L GEN IV Flex L96 Vortec (364) 6L GEN IV Flex LC8 Vortec (364) 6L GEN IV L96 Vortec (364) 6L GEN IV LC8 Vortec (364) CNG DIESEL FLEX GAS AirLift AirLift LoadLifter 5000 Leaf Spring Leveling Kit - 57338 57338 Suspension Load Leveling Kit