2020-2025 GM HD 8" MAX 3.3 Lift Kit w/ 3.3 Falcon Shocks (42-30840)

The ReadyLIFT 8-inch MAX3.3 Suspension System is a premium lift kit for 2020-2025 Chevy Silverado and GMC Sierra 2500/3500 HD trucks. This performance-focused kit is designed to improve stance, performance, and capability, clearing the way for larger wheels and tires. The system features vehicle-specific performance-tuned Falcon 3.3 shocks on all four corners, which provide a better-than-factory feel and are ideal for daily driving, off-road excursions, and tow/haul duties.

Features

• Delivers 8 inches of lift.
• Includes Xtreme-Duty fabricated 4130 chromoly steel upper control arms with corrected ball joint angles.
• Features Falcon 3.3 Fast Adjust Dampers, offering a wide range of adjustability with two separate knobs.
• The 3.3 dampers have a 3-Position Fast Adjust Knob (Soft, Custom, Firm) and an 8-Position Micro Adjust Dial for refined damping.
• Includes heavy-duty fabricated steel components utilizing 3/16-inch and 1/4-inch steel plate.
• Features laser-cut, CNC formed heavy-duty front and rear drop crossmembers.
• Comes with a full-coverage differential skid plate constructed from 3/16-inch steel plate.
• Includes new cast iron OE-style knuckles and forged torsion keys with the proper amount of indexing.
• Torsion bar relocation brackets eliminate the traditional lowering of the torsion bars, improving ground clearance.
• Includes crucial differential drop brackets, CV axle spacers, and OE style cast rear lift blocks.

Notes

• Some GM HD trucks equipped with a Tow Package may require custom-length U-bolts purchased separately.
• Vehicle alignment and headlamp aim must be checked and adjusted after product installation.
• If the vehicle is equipped with Advanced Driver Assistance Systems (ADAS), these systems may require recalibration.

Compatibility Notes

• Fits 2020-2025 Chevy Silverado and GMC Sierra 2500/3500 HD trucks.
• Does not work with AT4X or ZR2 models due to factory Multimatic shocks that cannot be replaced.
• The Single Cab configuration has not been validated for fitment and drivability by ReadyLIFT.
• Factory wheels can be used if wheel spacers are utilized.

Tire Fitment

• Allows for up to 37x12.50 tires on a 20x9-inch wheel with a 0 offset.
• Maximum tire diameter is 38 inches.
• Maximum tire for no rub is 38x12.50 on a 9-inch wide wheel with 0 offset.

Specs

• Lift Height: 8 inches.
  
• Shock Type: Falcon 3.3 Fast Adjust Dampers (front are coilover/remote reservoir, rears are smooth body/piggyback).
  
• Upper Control Arm Material: Xtreme-Duty fabricated 4130 chromoly steel.
  
• Crossmember Material: 3/16-inch and 1/4-inch steel plate.
  
• Skid Plate Material: 3/16-inch steel plate.
  
• Kit Contents: Crossmembers, Cast Iron Knuckles, Fabricated UCAs, Falcon Shocks, Forged Torsion Keys, Torsion Bar Relocation Brackets, Differential Drop Brackets, CV Axle Spacers, Rear Lift Blocks, and Skid Plate.