ReadyLIFT 6 Inch (6+2) Big Lift Kit - 2025-2026 Chevy Silverado 1500 Trail Boss GMC Sierra 1500 AT4 (44-35625)

This ReadyLIFT 6+2 big lift kit is made for the 2025-2026 Chevy Silverado 1500 Trail Boss and GMC Sierra 1500 AT4. It adds 6 inch of lift on top of the 2 inch factory lift, for 8 inch total, and clears a 37x12.50 tire on a 20x9 wheel with 0 offset and no trimming. The rear uses 5 inch tall fabricated steel blocks plus a rear add-a-leaf, and ReadyLIFT's page lists Falcon 1.1 monotube extended-length rear shocks with the kit. It is not for diesel engines.

Key features

• Lower strut clamshell design that keeps factory geometry and reuses the factory strut
• Tube steel upper control arms with maintenance-free pivot bushings and 1-ton ball joints
• Fabricated steel 5 inch rear lift blocks with integrated bump stop landings and an offset pin, plus a rear add-a-leaf for an additional 1.5 inch of lift
• Falcon 1.1 monotube extended-length rear shocks
• 3/16 inch steel plate cross members and skid plate
• Boxed, gusseted steel plate differential drop brackets with an anti-torsion design

What's included

• Front and rear cross members and skid plate
• Top mount strut extensions and rear shock extensions
• Strut pre-load spacer
• Sway bar drop brackets
• Fabricated steel rear lift blocks with bump stop landings
• Cast iron lift knuckles
• Rear add-a-leaf
• Falcon 1.1 monotube extended-length rear shocks
• Hardware and instructions

Fitment and compatibility

• Fits 2025-2026 Chevy Silverado 1500 Trail Boss and GMC Sierra 1500 AT4 only
• Designed for 4WD trucks with the 2 inch factory lift (new body style)
• Not for diesel engine applications, since no oil line relocation bracket is included
• Not compatible with rear mono-leaf springs
• Single Cab configurations have not been validated for fitment or drivability by ReadyLIFT
• Use of the Auto 4 Hi feature is not recommended
• Larger setups may need trimming at the front valance, felt liner edges and a mud flap edge. Test fit every tire and wheel combination; recommendations are based on Wheel Pros wheels and Nitto tires

Specifications

• Brand: ReadyLIFT
• Part number: 44-35625
• Kit lift: 6 inch (6+2)
• Total lift: 8 inch with the factory 2 inch lift
• Rear: 5 inch blocks plus a 1.5 inch add-a-leaf
• Max tire: 37x12.50 on a 20x9 wheel, 0 offset, no trimming
• Max tire with trimming: 37x12.50 on a 20x10 wheel, -18 offset
• Material: Steel and cast iron
• Rear shocks: Falcon 1.1 monotube listed in the kit
• Hardware included: Yes
• Estimated install time: 10 hours, plus or minus 1 hour
• Warranty: Includes ReadyGuard Powertrain Warranty

Installation

Allow about 10 hours, plus or minus 1, not counting alignment or wheel and tire assembly. A do it yourself install is possible, but a certified mechanic is recommended. An alignment, a headlamp aim check and ADAS recalibration may be needed, at extra cost.

Modifying your suspension can change handling and rollover risk (SAE J2492). Always wear your seat belt. ReadyLIFT's page carries a California Proposition 65 warning that names DEHP.