If you're looking for a mild lift for just the rear of your truck, you've come to the right place! Ready Lift rear lift kits are an easy solution that is easy to install, safe to use, and best of all, maintain factory ride quality, quaranteed. This ReadyLift rear lift kit achieves lift for your truck with a pair of coated lift blocks, new longer coated U-bolts, and all necessary hardware. The cast iron design is guaranteed never to break or fail, unlike some cheap competitors parts of lesser quality. This simple solution means you won't have to compress your springs, and you can probably to the installation yourself in your own garage. Your ReadyLift rear lift kit will come with everything you need for a quick and easy installation. All necessary hardware, as well as detailed instructions that include photos, and a Lifetime Warranty are included. The part number for this Ready Lift rear lift block kit is 66-3121 and it fits 2011-2018 Chevy Silverado & GMC Sierra 3500HD (DUALLY ONLY), giving a 1" Rear Lift.