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2019-2020 GMC AT4 And Chevy Trail Boss - 1.75'' Leveling Kit

$499.95
Out of stock
SKU
66-3921

1.75" front leveling lift for AT4 and Trail Boss

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

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

This product ships in 7-10 business days.

Have a question? Please call 877-759-9991

TIRE/WHEEL SIZING GUIDE

California Residents: Prop 65 WARNING prop65 Cancer, Birth Defects and Reproductive Harm www.P65Warnings.ca.gov
  • 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 all-new 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. 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


  • 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

  • Heavy Duty tubular steel upper control arms with TCT maintenance free pivot bushings and heavy-duty 1-ton ball joints.

    CNC machined billet aluminum top and bottom mount strut spacers.

  • Do it yourself!

    Please read 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)

    Have a certified mechanic do it for you!

  • California Residents: Prop 65 WARNING prop65 Cancer, Birth Defects and Reproductive Harm www.P65Warnings.ca.gov
Details

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 all-new 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. 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


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

Kit Components

Heavy Duty tubular steel upper control arms with TCT maintenance free pivot bushings and heavy-duty 1-ton ball joints.

CNC machined billet aluminum top and bottom mount strut spacers.

Installation

Do it yourself!

Please read 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)

Have a certified mechanic do it for you!

Additional Information
California Residents: Prop 65 WARNING prop65 Cancer, Birth Defects and Reproductive Harm www.P65Warnings.ca.gov
Quick Overview

1.75" front leveling lift for AT4 and Trail Boss

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

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

Warning: This product can expose you to chemicals include [name of chemical], which [is/are] known to the State of California to case [cancer]/[birth defects or other reproductive harm]. For more information go to www.P65Warnings.ca.gov.