6" 2020-2026 Sierra 2500HD/3500HD GMC MAX 3.3 Lift Kit (w/Falcon 3.3 Monotube Shocks) by ReadyLift

The ReadyLIFT 42-30660 6” MAX3.3 Premium Suspension System is engineered for truck owners who demand maximum performance, capability, and confidence—on the highway, at the jobsite, or deep into the backcountry. Designed for GMC Sierra 2500HD / 3500HD models, this full suspension system combines heavy-duty construction with advanced shock technology to deliver unmatched strength, handling, and ride quality.

At the core of the MAX3.3 system are Falcon 3.3 Fast Adjust Piggyback Shocks, the most advanced shocks ReadyLIFT has ever offered for HD trucks. Featuring independent dual-knob adjustability, drivers can fine-tune both compression and rebound damping for any terrain or load. Whether towing, hauling, or off-roading, the MAX3.3 puts complete ride-control customization at your fingertips. This system is built from the ground up with precision-engineered components, including laser-cut, CNC-formed crossmembers, a full-coverage 3/16” steel differential skid plate, OE-style cast iron knuckles with corrected geometry, and Xtreme-Duty 4130 chromoly upper control arms. Cast rear lift blocks and fabricated torsion arm brackets maintain a level stance while delivering long-term durability and reliable strength.

Clearing up to 37x12.50 tires on 20x9 wheels (0 offset), the ReadyLIFT MAX3.3 system gives GM HD trucks a commanding stance without compromising drivability. With Falcon’s reservoir-equipped, hard-anodized 6061-T6 aluminum shock bodies, VOD piston technology, and Red Line High VI oil, this system maintains consistent damping and control in temperatures ranging from -50°F to 450°F. The result is a suspension package built for towing, hauling, off-road adventure, and everyday driving—all with premium ride quality and the versatility serious truck owners demand.

Features and Benefits:

• Fits GMC Sierra 2500HD/3500HD models
• Falcon 3.3 Fast Adjust Piggyback Shocks with independent dual-knob tuning
• 3-position compression adjustment: Soft, Custom, and Firm
• 8-position Micro Adjust dial for precise rebound damping control
• Reservoir-equipped shock design for consistent damping across temperature changes
• Hard-anodized 6061-T6 aluminum shock bodies for impact and corrosion resistance
• VOD (Volume Optimized Damping) piston technology reduces body roll and prevents bottoming out
• Red Line High VI shock oil performs in extreme temperatures from -50°F to 450°F
• Laser-cut, CNC-formed crossmembers for maximum strength and durability
• 3/16” steel full-coverage differential skid plate for added protection
• OE-style cast iron steering knuckles with corrected geometry
• Xtreme-Duty 4130 chromoly upper control arms with corrected ball joint angles
• Cast rear lift blocks and fabricated torsion arm brackets for a level, stable stance
• Clears up to 37x12.50 tires on 20x9 wheels with 0 offset
• Engineered for towing, hauling, off-road adventures, and daily driving
• Delivers premium ride quality with serious strength and long-term reliability