ReadyLift - 1.75" Leveling Kit with Upper Control Arms - 2019-2025 GM 1500 (AT4/Trail Boss) - 66-3921

1.75" front leveling kit with tubular upper control arms for the factory-lifted GMC AT4 and Chevy Trail Boss.

The GMC AT4 and Chevy Trail Boss come with a factory 2" front lift and a longer front shock/strut assembly, so a traditional leveling kit can cause control-arm ball-joint binding and lower-strut/CV-axle contact. The 66-3921 provides 1.75" of lift without conflicting with the factory strut geometry. Because the factory upper control arm has limited dynamic range when lifted, the kit includes ReadyLift tubular upper control arms with corrected ball-joint cup angles, heavy-duty replaceable ball joints, and TCT maintenance-free pivot bushings with side-biter washers to improve alignment retention.

Fits: 2019-2025 GMC Sierra 1500 AT4 and Chevy Silverado 1500 Trail Boss (factory-lifted 4WD). Not compatible with Sierra AT4X or Silverado ZR2.

Features

• 1.75" of front lift
• CNC-machined aircraft-grade billet aluminum top and bottom strut spacers
• Includes DOM tube-steel upper control arms with TCT maintenance-free pivot bushings
• Corrected ball-joint cup angles with 1-ton ball joints

Kit Includes

• Billet aluminum top and bottom strut spacers
• Pair of tubular DOM steel upper control arms
• All necessary hardware

Tire Fitment

AT4: up to 275/60R20 on a 20x9 0 offset wheel. Trail Boss: up to 295/65R20 on a 20x9 0 offset wheel (or 285/75R18 on factory wheels with spacers). AT4 and Trail Boss differ due to front fender-opening design.

Notes

Not compatible with Sierra AT4X or Silverado ZR2. Estimated installation time about 4 hours (excluding alignment and wheel/tire assembly). Includes the ReadyGuard Powertrain Warranty. Backed by the ReadyLift limited lifetime warranty.