2019-2023 GMC AT4 / Chevrolet Tail Boss Silverado 1.75" Leveling Kit ReadyLIFT 66-3921

Introducing the ReadyLIFT 66-3921 1.75" Leveling Kit, meticulously crafted to elevate your 2019-2023 GM AT4 and Chevrolet Trail Boss trucks to new heights of performance and style. Engineered with precision and durability in mind, this leveling kit provides the perfect balance of lift and compatibility, ensuring an enhanced driving experience without compromising factory integrity.

This leveling kit features a 1.75" front lift specifically designed for the GM AT4 and Trail Boss models, offering an ideal solution to achieve the desired lift height without sacrificing performance. It's important to note that this kit is not compatible with the Sierra AT4X or Silverado ZR2 Edition.

Included in the kit are DOM tube steel upper control arms equipped with TCT maintenance-free pivot bushings and heavy-duty 1-ton ball joints, ensuring superior strength and durability. The CNC machined aircraft-grade billet aluminum top and bottom strut spacers provide exceptional support and stability, ensuring reliable performance on and off the road.

For the GM AT4, the maximum tire size recommended is 275/60-20, paired with a 20x9 wheel with 0 offset. Meanwhile, for the Chevrolet Trail Boss, a maximum tire size of 295/65-20 is recommended, also paired with a 20x9 wheel with 0 offset. Notably, if you choose to reuse factory wheels on a Trail Boss, you can accommodate a maximum tire size of 285/75R18 without any trimming required.

This leveling kit addresses concerns regarding factory strut geometry and clearances, ensuring compatibility and preventing any binding issues with the control arm ball joint or contact concerns with the lower strut/CV axle assembly. Furthermore, the kit includes tubular upper control arms with corrected ball joint cup angles and Terrain Control Technology (TCT) maintenance-free pivot bushings with side-biter washers, enhancing alignment retention and overall performance.

With the ReadyLIFT 66-3921 1.75" Leveling Kit, you can elevate your GM AT4 or Chevrolet Trail Boss to new heights while maintaining optimal performance and durability. Experience the difference today and take your off-road adventures to the next level.

Tire Fitment: 

• Note: AT4 and Trail Boss do not fit the same size tire. This is due to the difference in front fender opening design.

  66-3921 Leveling Kit:

  AT4 - Max tire 275/60-20, 20x9 0 offset wheel

  Trail Boss - Max tire 295/65-20, 20x9 0 offset wheel

  If re-using factory wheels on a Trail Boss, you can run max tire size 285/75R18 with NO trimming!

  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.