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. |

