Rancho RS994381 RS9000XL Rear Shock 3-4in Lift Chevy GMC Silverado Sierra 2500HD

Vehicle Fitment

• 2011-2025 Chevrolet Silverado 2500HD (WT, LT, LTZ, High Country, Custom) - 2WD and 4WD, Rear, 3 to 4 Inch Rear Lift
• 2011-2025 Chevrolet Silverado 3500HD (WT, LT, LTZ, High Country) - 2WD and 4WD, Rear, 3 to 4 Inch Rear Lift
• 2011-2025 GMC Sierra 2500HD (Base, SLE, SLT, AT4, Denali) - 2WD and 4WD, Rear, 3 to 4 Inch Rear Lift
• 2011-2025 GMC Sierra 3500HD (Base, SLE, SLT, AT4, Denali) - 2WD and 4WD, Rear, 3 to 4 Inch Rear Lift
• Engines: 6.0L V8 (gas), 6.6L V8 (gas), 6.6L V8 Duramax Diesel (LML, L5P)

Fitment Notes

• Rear position only. Sold individually - order two for a complete rear shock replacement.
• Compatible with both 2WD (RWD) and 4WD configurations across all applicable trims.
• Designed for 3 to 4 inch rear lift applications only. For stock height rear applications, a different shock is required. For lifts outside the 3 to 4 inch range, a different extended-length shock will be needed.
• Commonly paired with RS994377 (front shock, stock height) for a complete RS9000XL front and rear upgrade on lifted 2500HD/3500HD trucks.
• Replaces legacy Rancho part number RS999381 - direct 4th-generation upgrade with integrated bottom mounts and dual component 2K paint finish.
• Not for use with aftermarket shock spacers or relocation brackets.

Features

• 9-position adjustable damping knob delivers precise rear ride control from soft daily-driver comfort to firm towing and off-road performance - adjustable by hand without tools.
• 4th-generation RS9000XL design features integrated bottom mounts for enhanced structural strength over previous-generation welded mounts.
• Dual component 2K paint finish provides superior chip resistance and long-term corrosion protection over the legacy liquid metallic coating.
• Large 2.75-inch tri-tube body with all-weather fluid operates cooler and delivers consistent damping under sustained heavy-duty towing, hauling, and payload loads at the increased ride height.
• 18mm nitro-carburized piston rod resists scuffing and corrosion for long-term durability under the demanding stress of lifted HD truck applications.
• 11.50 inches of travel accommodates the suspension articulation range introduced by 3 to 4 inch lift systems on the 2500HD/3500HD platform.
• Nitrogen gas pressurization minimizes air-to-oil mixing to prevent damping fade during extended towing or off-road sessions.

Specifications

• Position: Rear (Left or Right)
• Lift Range: 3 to 4 inches
• Damping Adjustment: 9-Position Manual Knob
• Shock Body: 2.75 in. Tri-Tube, All-Weather Fluid
• Piston Rod: 18mm Nitro-Carburized
• Piston: Graphite-Filled Fluon-Banded, 1.25 in. Sintered Iron
• Gas Charge: Nitrogen (120 PSI)
• Extended Length: 29.44 in.
• Compressed Length: 17.94 in.
• Travel: 11.50 in.
• Upper Mount: LS47
• Lower Mount: LS47
• Finish: Dual Component 2K Paint (Liquid Metallic Silver)
• Bottom Mount: Integrated (4th-Generation)
• Drivetrain: 2WD and 4WD
• Operating Temperature Range: -40°F to 248°F
• Sold: Individually
• Warranty: Rancho Limited Lifetime Warranty
• Replaces: RS999381 (Legacy Part Number)

Included Components

• 1x Rancho RS994381 RS9000XL Rear Shock Absorber
• 1x Polyurethane Bushing Set
• 1x Protective Polyvinyl Shock Boot
• 1x Hardware Pack (washers, bushings, and nuts)

Product Description

The Rancho RS994381 is the 4th-generation RS9000XL rear shock absorber for 2011-2025 Chevrolet Silverado 2500HD and 3500HD, and GMC Sierra 2500HD and 3500HD trucks running 3 to 4 inches of rear lift, directly replacing the legacy RS999381. Compatible with both 2WD and 4WD configurations across all gasoline and Duramax diesel engine applications, it delivers 11.50 inches of travel to accommodate the suspension range introduced by HD-platform lift systems at this height. The 4th-gen design brings integrated bottom mounts for improved structural rigidity and a dual component 2K paint finish that outperforms the legacy liquid metallic coating in chip and corrosion resistance.

The 9-position manually adjustable damping knob allows HD truck owners to fine-tune rear ride quality from soft highway comfort to firm and controlled for maximum GVWR towing or loaded off-road runs. The large 2.75-inch tri-tube body and nitrogen gas charge maintain consistent damping performance under the sustained heavy-duty loads and repeated towing cycles expected of these platforms. Sold individually - two are required for a complete rear replacement. Commonly paired with RS994377 (front, stock height) for a complete matched front-to-rear RS9000XL upgrade on lifted 2500HD/3500HD trucks.