Rancho RS90000XL 4″ Rear Lift Shocks for 2011-2018 GMC Sierra 3500HD

Rancho RS9000XL 4″ Rear Lift Shocks for 2011-2018 GMC Sierra 3500HD

Part Number: RS999381

Summary: The Rancho RS9000XL series delivers industry-leading versatility for the GMC Sierra 3500HD, featuring a 9-position manual adjustment knob that allows drivers to instantly tune damping levels. Engineered for heavy-duty applications, these shocks solve the compromise between empty-bed comfort and maximum towing stability. Whether navigating highway commutes or hauling heavy payloads, this adjustable system provides the specific valving required for 4-inch lifted rear suspension configurations.

Features

• 9-Position Tuning: A manual adjustment knob provides nine levels of damping control to ensure the perfect balance of ride quality and stability for towing or off-road use.
• Large Shock Body: A 2.75-inch diameter reserve tube provides increased fluid capacity to ensure cooler operating temperatures during heavy hauling.
• Nitrogen Gas Charged: High-pressure gas displacement provides immediate response to road irregularities to ensure consistent tire-to-ground contact.
• Protective Boot: A heavy-duty red polyvinyl boot provides a physical barrier against road debris and moisture to ensure long-term seal integrity.

Technical Specifications

Fitment

• 2011-2018 GMC Sierra 3500HD
• Note: Fits models with 4″ rear lift height.

What’s Included

• Includes 2 Shocks
• Protective Polyvinyl Shock Boots
• Required Mounting Hardware

Why Choose This Product?

• Engineering Advantage: Rancho’s MyRide technology allows for a 400% change in damping force across the 1-to-9 dial range, offering more adjustability than standard monotube shocks.
• Performance Benefit: This shock eliminates the “one size fits all” valving approach, allowing the driver to stiffen the rear end for heavy tongue weights or soften it for daily driving.

Related Products

RS5000X (Rear):
Rancho RS5000X 4" Rear Lift Shocks for 2011-2018 GMC Sierra 3500HD

RS5000X (Front):
Rancho RS5000X 4" Front Lift Shocks for 2011-2018 GMC Sierra 3500HD

RS7MT (Front):
Rancho RS7MT 4" Front Lift Shocks for 2011-2018 GMC Sierra 3500HD

RS7MT (Rear):
Rancho RS7MT 4" Rear Lift Shocks for 2011-2018 GMC Sierra 3500HD

Front Only (Same Series):
Rancho RS90000XL 4" Front Lift Shocks for 2011-2018 GMC Sierra 3500HD

RS90000XL (Kit):
Rancho RS90000XL 4" Lift Shocks for 2011-2018 GMC Sierra 3500HD

RS7MT (Kit):
Rancho RS7MT 4" Lift Shocks for 2011-2018 GMC Sierra 3500HD

RS5000X (Kit):
Rancho RS5000X 4" Lift Shocks for 2011-2018 GMC Sierra 3500HD

Frequently Asked Questions

Do I need tools to adjust the shock settings?
No, the 9-position adjustment knob is designed for manual operation, allowing you to change your ride quality by hand in seconds.

Will these shocks lift my GMC Sierra 3500HD?
No, these shocks do not create lift. They are specifically configured for vehicles that already have a 4-inch rear lift kit installed.

What is the benefit of the large 2.75-inch body?
The larger body houses more oil, which dissipates heat more effectively than smaller shocks, preventing “shock fade” during heavy-duty work.