AT4/TRAIL BOSS PLUS 1.75" LEVELING KIT- GM 1500 AT4/TRAIL BOSS 4WD 2019-2026

MPN: 66-3921

INCLUDES: Spacers and Upper Control arms

SUSPENSION LIFT HEIGHT: 1.75” 

Vehicle Fitment: 2019-2026 Chevy Silverado Trail Boss / GMC Sierra AT4 1500 Trucks Only 

*does Not fit ZR2 or AT4X

• Readylift

  We specifically did not include the factory lift kit-equipped GMC AT4 and Chevy Silverado Trail Boss. The AT4/Trail Boss are factory equipped with a 2" front lift. This front lift includes a longer front shock/strut assembly. When combining a traditional leveling kit on these factory lifted trucks, several issues present themselves including binding problems with the factory control arm ball joint and contact concerns with the lower strut/CV axle assembly.

  The ReadyLIFT 66-3921 1.75" leveling kit is similar to our popular 66-3086 leveling kit for pre-2019 trucks. The 66-3921 leveling kit provides required amount of lift without causing conflict with the factory strut geometry and clearances. In light of the factory upper control arm's lack of dynamic range when the AT4/Trail Boss truck is further lifted, this leveling kit includes our popular tubular upper control arms with corrected ball joint cup angles, heavy-duty replaceable ball joints and out new Terrain Control Technology (TCT) maintenance-free pivot bushings with side-biter washers to improve alignment retention.

  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

  • 2019-2026 GMC AT4 And Chevy Trail Boss - 1.75" Leveling Kit (part number 66-3921).

    ReadyLIFT customers have asked for it and we have delivered. In fall of 2018 we announced our new leveling and SST lift kit offerings for the GM 1500 trucks. We specifically did not include the factory lift kit-equipped GMC AT4 and Chevy Silverado Trail Boss. The AT4/Trail Boss are factory equipped with a 2" front lift. This front lift includes a longer front shock/strut assembly.

    When combining a traditional leveling kit on these factory lifted trucks, several issues present themselves including binding problems with the factory control arm ball joint and contact concerns with the lower strut/CV axle assembly. The ReadyLIFT 66-3921 1.75" leveling kit is similar to our popular 66-3086 leveling kit for pre-2019 trucks.

    In light of the factory upper control arm's lack of dynamic range when the AT4/Trail Boss truck is further lifted, this leveling kit includes our popular tubular upper control arms with corrected ball joint cup angles, heavy-duty replaceable ball joints and out new Terrain Control Technology (TCT) maintenance-free pivot bushings with side-biter washers to improve alignment retention. Includes DOM tube steel upper control arms with TCT maintenance-free pivot bushings and 1-ton ball joints CNC machined aircraft-grade billet aluminum top and bottom strut spacers AT4

    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 wheel spacers!

    Fitment and Installation Notes

    • 1.75" front leveling lift for 2019-2026 GM AT4 and Trail Boss Not compatible with Sierra AT4X or Silverado ZR2 Edition.
    • The 66-3921 leveling kit provides required amount of lift without causing conflict with the factory strut geometry and clearances.
    • AT4 and Trail Boss do not fit the same size tire. This is due to the difference in front fender opening design.
    • Not compatible with Sierra AT4X or Silverado ZR2 Edition. 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