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ReadyLIFT® offers a  heavy-duty adjustable leveling kit for the all-new 2020-2022 Chevy Silverado and GMC Sierra 2500/3500 HD trucks including the popular AT4 package. Along with the outward appearance changes to the new GM HD, General Motors also made changes to the long-standing torsion bar suspension. These changes required ReadyLIFT to engineer anew leveling that is specifically designed to function and install properly on this new suspension design. Our dedication to professional engineering and manufacturing has yielded a new adjustable forged torsion key leveling kit system that provides a comfortable ride and allow for 35" tires.

The 66-3020 Adjustable Leveling Kit includes our industry-leading forged torsion keys that feature new indexing specific to the new 2020-2022 GM HD platform. This kit also includes front shock extensions, differential drop spacers and factory skid plate spacers. Leveling lift is in the range of 2", but the amount of actual lift required will depend on the vehicle. This kit includes differential drop spacers to help maintain factory geometry and corrects CV axle angles. 66-3020 works with trucks equipped with either the OE #84461807 or OE #84634344 factory torsion keys and requires ReadyLIFT torsion key unloading tool 66-7822B or similar for installation.

Why Choose ReadyLIFT 2020 GM HD Leveling Kits?

Maintains the factory ride and handling.

Features industry-leading forged torsion keys with specific indexing designed for each application.

Delivers clearance for increased aftermarket tire sizes - up to 35''

Kits include important CNC machined billet Aluminum differential drop spacers with longer hardware to ensure correct CV angles and drive line geometry.

Maintains use of the factory skid plate via new skid plate spacers.

Every kit includes ReadyGuard Powertrain Warranty.

Tire Fitment

20x9 +18 or 0 offset - 35x12.50 tire.
*Trimming may be required with some tire styles on 20x9 0 offset - 35x12.50 or 325/60R20
Note: Silverado and Sierra have different fender well opening sizes - some minor trimming my be required depending on true tire size and design.
Tire Size Note: ReadyLIFT wheel and tire fitment recommendations are typically based on Wheel Pros wheels and Nitto tires. Due to product differences among tire manufacturers, tire specifications and dimensions including, but limited to, overall diameter, rolling diameter, tread width, aspect ratio, lug pattern, sidewall construction and inflation pressure, will vary meaningfully by tire and wheel manufacturer. Every tire and wheel combination should be test fit prior to installation. Consult your local installer to learn more about the right tire fitment for your application.
Ride Quality Note: When lifting a vehicle and installing aftermarket wheels and tires, a tire manufacturer's construction and material quality can alter vehicle ride quality. When increasing a vehicle wheel and tire size, most larger aftermarket truck and SUV tires are 10-ply (or more) E tires compared to typical OEM 6-ply C tires. This more rigid sidewall construction increases the perception of suspension stiffness often described as ride harshness. The ride, handling, traction, noise, fuel economy, and wear differences between All-Season, All-Terrain, Mud-Terrain, or Trail-Terrain type tires can be significant. Please take into account tire and wheel choice will generally have a meaningful impact on the ride & handling experience.

Kit Components

Torsion Key Qty 2
Front Shock Spacer Qty 4
Differential Spacers Qty 4
Heavy duty Differential laser cut washes Qty 4
Skid Plate Spacers QTY 4
Replacement Shock flange nuts Qty 4
Extended Differential mounting bolts Qty 4
Extended Skid Plate mounting bolts Qty 4
Heavy duty Skid Plate washers Qty 4



Please read the instructions thoroughly and completely before beginning installation. Installation by a certified mechanic is recommended. ReadyLIFT Suspension Inc. is NOT responsible for any damage or failure resulting from improper installation.

Download Pdf Instructions

Estimated Installation Time: 3.5 Hours +/- 0.5 hours (excluding alignment and wheel/tire assembly)