The CST 6"-8" Stage 1 Lift Kit CSK-C3-15-1 provides a superior fit, function and finish on your 2011-2019 GM 2500HD 4WD pickup. Improved ride quality, O.E. steering geometry, O.E. CV angles, O.E. track-width, thats just a few of the many reasons CST Performance Suspension is known as the 2500HD specialists. You could also say they paved the way for sub-frame style lift kits, twenty years ago and long before the current trend. Fifteen years later, like the 2500HD, CST lift kits are still evolving and still continue to uphold our reputation! This 6-8" kit uses a one piece sub-frame, fabricated steering knuckles, steering drop down and will retain the factory handling! CST has combined their experience in off road racing with trophy truck quality engineering to ensure that your suspension will have increased strength, performance, overall build integrity and perform better than stock. Throughout the initial design and R&D process CST made sure to retain the factory O.E. suspension geometry and design attributes! This standard 6-8" adjustable kit for the front end includes CST one-piece gusseted sub-frame with a steel full size differential skid plate, fabricated steel, CNC machined front steering knuckles, high strength steering drop center-link with heim jointed support links to minimize wear of the factory idler and pitman arms, differential drop brackets, heavy duty bump stop brackets, extended sway bar end links, brake line drop brackets, CST laser cut torsion x-member drop brackets, all necessary hardware, and O.E. front shock extensions. No cutting of the front differential is required or welding of any kind and the entire truck can be put back to stock if needed. The 6-8" lift kit retains the factory front wheel track width and has zero compatibility issues with the GM Stabilitrak system. The rear kit includes fabricated 4" lift blocks with bump stop pads and heavy duty 3/4" zinc-plated u-bolts. Steering stabilizer brackets are built into the kit and the CST stabilizer shock kit can be purchased as an upgrade option (sold separately). All fabricated parts are covered in a high quality gloss black powdercoat finish. CST superior quality fit, function, and appearance. Wheel & Tire Guidelines:Â Most Factory OEM wheels AND tires will work with the lift kit installed Wheels For Use With Oversized Tires:Â - 17 x 8" or 9" w/ 5 1/4" BSÂ - 18 x 9" w/ 5 1/4" BSÂ - 20 x 9" or 10" w/ 5 3/4" BSÂ Some higher offset wheels may work. Test fitment required Tire Sizes For Factory O.E. 20" Or Aftermarket Wheels: Â - 35 x 12.50Â - 37 x 12.50 or 13.50 (minor trimming required - must be set to 8 inches of lift)Â Â Features Stage 1 Lift KitÂ 6"-8" Adjustable Lift HeightÂ Improved Handling & Ride Proudly Made In The USA!Â Increased Ground ClearanceÂ 1/4" Or Thicker Steel Construction For Extreme Strength Notes - Please Read For Additional Components Required: Extended length rear shocks are required. Sold separately.Â Factory spare tire can be used with 18" or larger wheels.Â 17" wheels must have no more than 5-1/4" backspacing.Â 20" or larger wheels must not have more than 5-3/4" backspacing.Â Rear shocks are required and available, but not included.Â Some 3500HD models may require additional components for truck to be completely level. This kit works in conjunction with GM Stabilitrak System.Â Kit uses factory front OE shocks.Â Trucks with 2-piece rear driveline require carrier bearing spacer (sold separately, see below). Torsion keys required for 8" of lift.Â 2015 and newer HD models require driveshaft (sold separately, see below). 2014 and older HD models should have driveshaft or vehicle will experience driveline vibration in 4WD. (sold separately, see below). See related products below for additional add-on and upgrade components.Â 3500HD Owners: This kit was designed and tested for the 2500HD trucks. It can be used on 3500HD and 3500HD Dually if the purchaser / installer is able to provide custom u-bolts for their application. Due to the many different spring and axle configurations, u-bolts are not included or offered for the 3500HD models. Neither XDP or CST offer u-bolts for these applications. You must be able to source them locally. Custom carrier bearing spacer may be required as well. Â Truck Freight Item: Allow 1-2 Weeks for delivery. Truck freight charges apply.