The ReadyLift 6 Inch MAX2.1 Lift Kit GM Silverado Sierra HD 2500HD, and 3500HD is a premium and comprehensive heavy-duty lift solution for HD truck owners who want serious ground clearance, standout off-road capability, and a confident and composed ride without giving up the on-road manners and towing performance that Silverado and Sierra HD owners expect.
Part number 42-30640: This system pairs heavy-duty fabricated steel front and rear drop crossmembers with vehicle-specific Falcon 2.1 monotube shocks at all four corners, a full-coverage differential skid plate, and optimized suspension geometry that maintains unobstructed travel and articulation throughout the full 6-inch lift range. At IMM Hawaii Parts, we carry this kit for GM 2500HD and 3500HD owners who want the most capable and complete 6-inch lift solution available for their heavy-duty truck.
ReadyLift 6 Inch MAX2.1 Lift Kit GM Silverado Sierra HD With Falcon 2.1 Monotube Shocks
The four Falcon 2.1 monotube shocks in this system are tuned specifically for the GM Silverado and Sierra 2500HD and 3500HD platforms running 6 inches of lift. The Falcon 2.1 shocks feature 6061-T6 aluminum bodies that resist impacts and corrosion, smooth honed internals for consistent long-term performance, and 3/4 inch induction hardened chrome plated shafts that resist rock damage and buckling on demanding terrain.
Hard anodized 6061-T6 billet pistons with one-piece Teflon bronze wear bands and O-ring seals complete the internal package for reliable damping performance through sustained hard use. Vehicle-specific tuning gives the Silverado and Sierra HD noticeably smoother highway ride quality and better controlled off-road performance compared to non-tuned shock alternatives on this platform. Customers at IMM Hawaii Parts consistently choose this system for its Falcon shock quality and the confidence that purpose-tuned damping brings to a 6-inch lifted heavy-duty truck.
Heavy-Duty Fabricated Steel Drop Crossmembers for Correct Geometry
The front and rear drop crossmembers in this system are laser-cut and CNC-formed from 3/16 and 1/4 inch plate steel, giving them the structural strength and precision needed to reposition the front and rear suspension correctly after 6 inches of lift is added to the GM 2500HD and 3500HD.
The drop crossmembers maintain correct suspension geometry throughout the lift range, which is critical on a heavy-duty truck that regularly operates at maximum payload and towing capacity, where compromised geometry would directly affect handling stability and component longevity. The heavy-duty fabricated construction is built to last through years of demanding use without the flexing or deformation that lighter materials would develop under the constant stress of HD truck operation.
Full Coverage 3/16 Inch Differential Skid Plate
A full coverage 3/16 inch differential skid plate is included in this system to protect the front differential from rock strikes, trail debris, and the undercarriage impacts that a lifted 6-inch HD truck encounters during off-road use. The skid plate is fabricated from the same heavy-duty plate steel used throughout the system and provides real protection rather than the token coverage that thinner or smaller skid plate alternatives offer. For GM 2500HD and 3500HD owners who take their lifted trucks off-road regularly, having a proper full-coverage skid plate included in the lift system is an important practical advantage.
Runs 37x12.50 Tires on 20x9 zero-offset wheels
This MAX2.1 system is verified to run 37x12.50 tires on 20x9 wheels at zero offset on the 2020 through 2025 Silverado and Sierra 2500HD and 3500HD. Running 37-inch tires on a 6-inch lifted HD truck gives the vehicle a commanding presence on the road and serious ground clearance for challenging off-road terrain. Always verify clearance on your specific truck before finalizing the wheel and tire setup, as fitment can vary between Silverado and Sierra models.
Important Compatibility Notes
This system is not compatible with AT4X or ZR2 models. Single Cab fitment and drivability have not been validated by ReadyLift. Some tow package-equipped trucks may require custom-length U-bolts depending on the specific application. If the standard U-bolts included in the lift kit are too short for your truck, source custom U-bolts locally to your truck's specifications before completing the installation.
Product Details
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Specification
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Details
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Compatible Vehicles
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2020 to 2025 GM Silverado 2500HD and 3500HD, Sierra 2500HD and 3500HD
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Part Number
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ReadyLift 42-30640
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Brand
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ReadyLift
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Lift Height
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6 inches
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Shocks
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Falcon 2.1 Monotube, All Four Corners
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Shock Bodies
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6061-T6 Hard Anodized Aluminum
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Shock Shafts
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3/4 inch Induction Hardened Chrome Plated
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Crossmembers
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Laser Cut CNC Formed 3/16 and 1/4 Inch Steel
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Skid Plate
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Full Coverage 3/16 Inch Differential Skid Plate
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Tire Fitment
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37x12.50 on 20x9 Zero Offset
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Not Compatible
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AT4X, ZR2
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Who Should Choose This Kit?
The ReadyLift 6 Inch MAX2.1 Lift Kit GM Silverado Sierra HD is the right choice for 2020 through 2025 Silverado and Sierra 2500HD and 3500HD owners who want a premium 6 Inch lift system with Falcon 2.1 monotube shocks, heavy-duty steel drop crossmembers, full coverage differential skid plate, and verified 37-inch tire clearance. Shop this kit and complete GM HD wheel and tire packages at IMM Hawaii Parts, where our team can help you build the perfect high-clearance Silverado or Sierra HD setup for serious off-road use and daily towing performance.
Not sure which product is right for your vehicle? Reach out to IMM Hawaii Parts for expert recommendations and dependable customer support.
