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GM 1500 suspension update
Big Lift Stance. Refined for Today’s GM Trucks.
ReadyLIFT has reengineered its GM 1500 Big Lift lineup, bringing improved steering geometry, enhanced drivetrain compatibility, and Falcon 2.1 rear shocks to supported 2019–2024 and 2025–2026 Chevrolet Silverado and GMC Sierra 1500 applications.
From daily driving to weekend adventures, a lifted truck should deliver more than added height. These updated systems combine the aggressive stance and added ground clearance ReadyLIFT owners expect with refinements to steering, drivetrain fitment, and damping performance.
Redesigned steering knuckles enhance maneuverability and steering performance.
Keep the functionality of your truck’s factory Auto 4WD system.
Premium monotube shock technology brings consistent damping to the updated lineup.
Application-specific engineering
Reengineered for a Changing Platform
OEM changes introduced for the 2025 model year, including larger front differentials, prompted ReadyLIFT to revisit its GM 1500 Big Lift systems. The updates address those changes while refining the suspension geometry for supported late-model trucks.
ReadyLIFT also carried key improvements back into 2019–2024 applications, creating a more consistent Big Lift offering across both model-year groups.
- Redesigned steering knuckles for improved turning radius
- Revised geometry engineered to help prevent driveline vibration
- Full retention of factory Auto 4WD functionality
- Streamlined fitment and installation across supported applications
Falcon 2.1 shock technology
Consistent Control Behind the Stance
Falcon 2.1 rear shocks are a key part of the reengineered lineup, pairing ReadyLIFT suspension engineering with a durable monotube damper design.
Increased oil capacity and heat dissipation support consistent damping performance.
A heavy-duty, induction-hardened, chrome-plated shaft is engineered to resist rock damage, corrosion, and buckling.
Falcon rear shocks complement the updated lift components for a more refined suspension package.
Choose your application
2025–2026 Silverado & Sierra 1500 Lift Kits
Select the kit designed for your truck’s model year and factory suspension. Trail Boss and AT4 applications use kits engineered around their factory 2-inch lift.
Part #44-35626
6-Inch Big Lift Kit
2025–2026 Silverado / Sierra 1500 Trail Boss / AT4
6-inch lift + factory 2-inch lift.
Includes Falcon 2.1 rear shocks.
Replaces 44-35625.
Part #44-35426
4-Inch Big Lift Kit
2025–2026 Silverado / Sierra 1500 Trail Boss / AT4
4-inch lift + factory 2-inch lift.
Includes Falcon 2.1 rear shocks.
Replaces 44-35425.
Part #44-35621
6-Inch Big Lift Kit
2025–2026 Silverado / Sierra 1500
Includes Falcon 2.1 rear shocks.
Replaces 44-35620.
Choose your application
2019–2024 Silverado & Sierra 1500 Lift Kits
Select the kit designed for your truck’s model year and factory suspension. Trail Boss and AT4 applications use kits engineered around their factory 2-inch lift.
Part #44-39421
4-Inch Big Lift Kit
2019–2024 Silverado / Sierra 1500 Trail Boss / AT4
4-inch lift + factory 2-inch lift.
Includes Falcon 2.1 rear shocks.
Replaces 44-39420.
Part #44-39806
8-Inch Big Lift Kit
2019–2024 Silverado / Sierra 1500
Includes Falcon 2.1 rear shocks.
Replaces 44-39805.
Part #44-39606
6-Inch Big Lift Kit
2019–2024 Silverado / Sierra 1500
Includes Falcon 2.1 rear shocks.
Replaces 44-39605.
Part #44-39621
6-Inch Big Lift Kit
2019–2024 Silverado / Sierra 1500 Trail Boss / AT4
6-inch lift + factory 2-inch lift.
Includes Falcon 2.1 rear shocks.
Replaces 44-39620.
Match the kit to your truck
Standard Suspension or Trail Boss / AT4?
Factory suspension configuration matters. Trail Boss and AT4 models start with a factory 2-inch lift, and the kits listed for those applications add the specified lift to that factory height.
For example, a 4-inch Trail Boss / AT4 kit is identified as a 4-inch lift plus the factory 2-inch lift. A 6-inch Trail Boss / AT4 kit is identified as a 6-inch lift plus the factory 2-inch lift.
Use the individual product pages to confirm the correct application and review wheel, tire, and installation requirements before ordering.
Chevrolet Silverado & GMC Sierra
The GM 1500 Big Lift Look
A more commanding profile, added ground clearance, and refined suspension engineering bring the updated lineup together.
Plan your build
Find the Right Big Lift for Your GM 1500
Explore the reengineered lineup and choose the ReadyLIFT system built for your Silverado or Sierra. Each product page includes the application details you need to plan your suspension upgrade.