ReadyLIFT 6 Inch (6+2) Big Lift Kit - 2025-2026 Chevy Silverado 1500 ZR2 GMC Sierra 1500 AT4X (44-35600)

This ReadyLIFT big lift kit is made for the 2025-2026 Chevy Silverado 1500 ZR2 and GMC Sierra 1500 AT4X. It adds 6 inch of lift on top of the factory 2 inch lift, for 8 inch total, and clears a 37x12.50 tire on a 20x9 wheel with 0 offset and no trimming. It is not for diesel models. Shocks are not included; rear shock extensions keep the factory performance shocks.

Key features

• Lower strut clamshell design that keeps factory geometry and retains the factory strut
• Tube steel upper control arms with maintenance-free pivot bushings and 1-ton ball joints
• Fabricated steel rear blocks, 5 inch tall, tapered 5 degrees, with an offset pin and integrated bump stop landings, plus an add-a-leaf kit
• 3/16 inch thick steel plate cross members and skid plate
• 1/4 inch boxed plate steel differential drop brackets with double gusset and a boxed center rib
• Angled, offset top mount strut extensions and a lower strut pre-load spacer for a slight spring rate increase

What's included

• Rear differential drop and crush sleeve
• Sway bar brackets (driver and passenger)
• Cam block off plates
• Strut extensions (driver and passenger) and pre-load spacers
• Knuckles (driver and passenger)
• Fabricated rear blocks (driver and passenger)
• Add-a-leaf kit
• Rear brake line bracket and rear ABS bracket
• CV axle spacer (1/4 inch thick outer spacer)
• Rear shock extensions and washers
• Hardware pack

Fitment and compatibility

• Fits 2025-2026 Chevy Silverado 1500 ZR2 and GMC Sierra 1500 AT4X only
• Not for diesel models, since no oil line relocation bracket is included
• Not compatible with rear mono-leaf springs
• Use of the Auto 4 Hi feature is not recommended
• Larger 10-ply or heavier E-rated tires can ride stiffer than the factory 6-ply C-rated tires
• 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: 44-35600
• Kit lift: 6 inch (6+2)
• Total lift: 8 inch with the factory 2 inch lift
• 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 with cast iron knuckles
• Shocks included: No
• Hardware included: Yes
• Estimated install time: 12 hours, plus or minus 1 hour
• Warranty: Includes ReadyGuard Powertrain Warranty

Installation

Allow about 12 hours, plus or minus 1, not counting alignment or wheel and tire assembly. ReadyLIFT recommends a certified mechanic. An alignment, a headlamp aim check and ADAS calibration 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.