Product Details

The ReadyLift 6" Big Lift Kit w/Falcon 2.1 Shocks is made for the 2019-2024 GMC Sierra 1500 AT4, giving it more ground clearance and room for larger tires.

The 44-39621 lift kit utilizes the very best in ReadyLIFT engineering with boxed steel front/rear cross members and a full-width front skid plate constructed of thick 3/16" plate steel. New 1/4-inch boxed plate steel differential drop brackets feature a double gusset and boxed center rib to take the abuse of front differential torsional twisting.

Our 6" (6" + 2") lift kit features heavy-duty angled and offset top mount strut extensions that realign the struts to optimize shock performance and minimize wear. A specially designed lower mount strut pre-load spacer offers the added benefit of a slight increase in spring rate to better handle the larger wheels and tires that will find their way onto this new lifted truck.

Features

  • Maintains the factory ride and handling
  • Click here to learn how to determine if you have rear mono-leaf springs. Single Cab configuration has not been validated for fitment & drivability by ReadyLIFT. Not for use on Diesel motor applications.
  • Delivers clearance for increased aftermarket tire sizes, up to 37x12.50 on 6-inch kit on 9" wide wheels with 0 offsets with no trimming. -18 offset will require minor trimming.
  • The proprietary lower strut clamshell design maintains factory geometry and retains the use of the factory strut
  • Tube steel upper control arms with maintenance-free pivot bushings and 1-ton ball joints
  • 3/16-inch thick steel plate cross members and skid plate
  • Anti-torsion boxed and gusseted plate steel differential drop brackets
  • Fabricated steel 5" rear lift blocks include integrated bump stop landings, offset pin, and provide proper pinon angle. Also includes rear add-a-leaf for additional 1.5" lift.

Installation Instructions

ReadyLIFT installation instructions (PDF)

Specifications
Part Number 44-39621
Part Name ReadyLift 6" Big Lift Kit w/Falcon 2.1 Shocks
Vehicle 2019-2024 GMC Sierra 1500
Drivetrain 4WD
Weight 265.00 lb
UPC 194933457298
Notes ReadyLIFT application: 6" (6-inch + Factory 2-inch) Big Lift Kit With 2.1 Falcon Shocks, 2019-2024 1500 Trail Boss / AT4.

Vehicle fitment

This product fits the vehicles listed below.

YearMakeModelDrivetrainNotes
2019GMCSierra 15004WD
2020GMCSierra 15004WD
2021GMCSierra 15004WD
2022GMCSierra 15004WD
2023GMCSierra 15004WD
2024GMCSierra 15004WD

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