2025-2026 GM 1500 Trail Boss / AT4 4" Big Lift Kit w/ Falcon 2.1 Shocks (44-35426)

Description

ReadyLIFT's reengineered 4" Big Lift Kit for the 2025-2026 Chevy Silverado 1500 Trail Boss and GMC Sierra 1500 AT4 adds 4" on top of the factory 2" lift. It is built around the larger front differential GM introduced for 2025, with redesigned steering knuckles for a better turning radius, retained factory Auto 4WD and revised geometry to help prevent driveline vibration, and it now ships with Falcon 2.1 Monotube rear shocks.

Part Number: 44-35426 (supersedes 44-35425)

Features

• Falcon 2.1 Monotube extended-length rear shocks (2.3" aluminum body, 3/4" shaft)
• Redesigned steering knuckles for an improved turning radius
• Retains factory Auto 4WD functionality
• Revised suspension geometry helps prevent driveline vibration
• Includes ReadyGuard Powertrain Warranty

Tire Fitment:

• *Max with trimming: 20x10 -18 offset - 35x12.50 or 325/60R20

Notes

• Use of Auto 4 Hi feature not recommended
• Not compatible with rear mono-leaf springs
• Single Cab configuration has not been validated for fitment & drivability by ReadyLIFT
• Not for use on diesel applications (no oil line relocation bracket included)
• 18" wheels are not recommended; an 18x9 with 0mm offset or higher does not fit