2020-2025 GM HD 6" Lift Kit w/ Falcon 2.1 Shocks (44-30621)

The ReadyLIFT 6-inch Lift Kit for 2020-2025 GM HD trucks is a comprehensive suspension system engineered to improve stance, capability, and driving dynamics. It utilizes heavy-duty laser-cut steel crossmembers and precision-engineered cast iron knuckles to maintain ideal suspension geometry. By retaining the factory torsion bars in their original location, this kit avoids the ground clearance loss typical of traditional lifts, making it an ideal choice for owners who want a tall, aggressive look combined with refined on-road comfort.

Features

• Delivers a full 6-inch front lift and 4-inch rear lift for a commanding, level stance.
• Includes four (4) vehicle-specific Falcon 2.1 Monotube Shocks for superior damping and roll control.
• Innovative torsion bar relocation brackets keep the torsion bars in the factory position to maximize ground clearance.
• OE-style cast-iron knuckles are precisely engineered to ensure proper alignment and steering geometry.
• Includes heavy-duty 3/16-inch and 1/4-inch fabricated steel drop crossmembers.
• Full-coverage differential skid plate provides essential off-road underbody protection.
• Equipped with CNC-machined billet aluminum CV axle spacers to maintain proper driveline angles.
• Maintains factory turning radius and overall driving characteristics.

Notes

• Requires some minor modifications/trimming for a complete bolt-on installation.
• Vehicle alignment, headlamp aim, and Advanced Driver Assistance Systems (ADAS) should be recalibrated after installation.
• Some trucks equipped with a factory Tow Package may require separate custom-length U-bolts.

Compatibility Notes

• Fits 2020-2025 Chevrolet Silverado and GMC Sierra 2500HD/3500HD 4WD and AT4 models.
• Not compatible with AT4X or ZR2 trim levels.
• Single Cab configurations have not been validated for fitment or drivability.
• Compatible with factory 20-inch wheels; smaller stock wheels may not fit.

Tire Fitment

• Maximum Tire Diameter: 37 inches.
• Recommended Setup: 37x12.50 tires on a 20x9 wheel with 0 offset (for no rubbing).

Shock Specs

• Shock Type: Falcon 2.1 Monotube Dampers (Front and Rear).
• Construction: 6061-T6 aluminum alloy shock bodies for high impact resistance and heat dissipation.
• Shaft: 3/4-inch induction hardened chrome plated shaft to resist corrosion and rock damage.
• Piston: Hard-anodized billet aluminum piston with a one-piece Teflon bronze wear band.
• Performance: Tuned specifically for GM HD trucks to improve dynamic roll control and low-speed damping.

Specs

• Lift Height: 6 inches (Front) / 4 inches (Rear).
• Material: 3/16-inch and 1/4-inch steel plate; Cast iron knuckles.
• Kit Contents: Iron knuckles, drop crossmembers, torsion bar relocation brackets, differential drops, CV spacers, skid plate, rear lift blocks, and Falcon 2.1 shocks.