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6" Big Lift Kit w/Falcon 2.1 shocks 2025-26 Trailboss, AT4 1500 4WD

By Ready Lift

Starting at

Original price $2,899.95 - Original price $2,899.95
Original price $2,899.95
Starting at$2,899.95
$2,899.95 - $2,899.95
Current price Starting at$2,899.95

Use of Auto 4 Hi feature not recommended
Does NOT fit mono leaf spring models
Single Cab configuration has not been validated for fitment & driveability
Not for use on Diesel motor applications
Not for use on Diesel as we don't include an oil line relocation bracket
Does NOT fit late model 2024 or 2025 applications that have round U-bolts

  • Details
  • Compatibility
  • Tire & Wheel Fitment

Built for drivers who demand relentless capability, this 6-inch Big Lift Kit upgrades your 2025-2026 Trail Boss or AT4 to dominate the toughest trails without sacrificing highway refinement. ReadyLIFT engineered this system around 3/16-inch thick boxed steel cross members, a full-width skid plate, and reinforced differential drop brackets designed to withstand high-torsion off-road abuse. The heavy-duty tube steel upper control arms house maintenance-free pivot bushings and massive 1-ton ball joints, maintaining ideal suspension geometry while utilizing the factory struts. A custom lower mount pre-load spacer slightly increases spring rate to comfortably support oversized wheels and aggressive tires. Out back, fabricated 5-inch rear lift blocks with bump stop landings combine with premium Falcon 2.1 Monotube extended shocks to ensure correct pinion angles, extra clearance, and exceptional rear stability. Rigorously trail-tested to guarantee a ride that handles better than stock, part number 44-35626 delivers maximum ground clearance, bulletproof durability, and the peace of mind of the ReadyGuard Powertrain Warranty.

Falcon 2.1 Monotube shocks will take your ride to the next level! The Falcon 2.1 features include dynamic roll control and low-speed damping. The Falcon 2.1 shocks have a 6061-T6 aluminum alloy shock body, hard anodized 6061-T6 aluminum alloy billet pistons, and a 1-piece Teflon bronze piston wear band w/ O-ring. The smooth-honed internal shock body surface provides long-term performance and the  3/4” induction hardened chrome plated shaft will resist damage, corrosion, and shaft buckling. The Falcon 2.1 large shaft diameter provides a wide range of adjustments on adjustable shocks.

Kit Components
Lifted steering knuckles
Strut spacers
Sway bar drop
Heavy duty front and rear crossmembers
Skid plate
5" rear block kit with bump stop landings
Falcon 2.1 series rear shocks

Kit Features
3/16-inch thick plate steel front and rear cross members
Made in the USA
Yields 6" lift on top of the factory 2" lift
Fits up to 37x12.50 on 9" wide wheels with 0 offsets with no trimming
Increased ground clearance
1 ton ball joints

View installation instructions

Readylift 6" kit fits the following 4WD models:

2025 Chevy Silverado 1500 TrailBoss
2026 Chevy Silverado 1500 TrailBoss

2025 GMC Sierra 1500 AT4
2026 GMC Sierra 1500 AT4

37x12.50 on 9" wheel and 0 offset