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

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

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

Part Number: RS999380 / RS999381

Summary: The Rancho RS9000XL series provides industry-leading versatility for the GMC Sierra 3500HD by featuring a 9-position manual adjustment knob. This Tier 2 adjustable technology allows drivers to instantly tune their damping profile from soft to firm to accommodate varying payloads or towing requirements. Engineered for heavy-duty applications with a 4-inch lift, these shocks solve the compromise between unloaded ride comfort and loaded stability.

Features

• 9-Position Tuning: A manual adjustment knob provides nine levels of damping control to ensure the perfect ride for towing, hauling, or daily commuting.
• Large Shock Body: The 2.75-inch diameter reserve tube provides increased oil capacity to ensure cooler operating temperatures during heavy-duty use.
• Nitrogen Gas Charged: High-pressure gas charging provides optimized piston response to ensure consistent performance on uneven terrain.
• Protective Boot: A heavy-duty liquid metallic finish and included dust boot provide protection against road debris to ensure long-term seal integrity.

Technical Specifications

Fitment

• 2011-2018 GMC Sierra 3500HD
• Note: Configured specifically for vehicles with 4-inch suspension lift systems.

What’s Included

• Includes Full Set (See Below)
• (2) RS999380 Front Shocks
• (2) RS999381 Rear Shocks
• Protective Red Dust Boots

Why Choose This Product?

• Engineering Advantage: Unlike standard “one-size-fits-all” shocks, Rancho’s MyRide technology allows for user-defined valving profiles without removing the shock from the vehicle.
• Performance Benefit: Eliminates the harshness typically associated with lifted heavy-duty trucks while maintaining the stiffness required for maximum towing stability.

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

RS90000XL (Rear):
Rancho RS90000XL 4" Rear 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

RS90000XL (Front):
Rancho RS90000XL 4" Front 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

How do I adjust the firmness of these shocks?
Simply turn the 9-position knob located at the base of the shock body to your desired setting; No tools or disassembly are required.

Will these shocks lift my GMC Sierra 3500HD?
No, these shocks do not create lift. They are specifically valved and length-indexed to work with a truck already equipped with a 4-inch suspension lift.

What setting should I use for towing?
For heavy towing or hauling, it is recommended to use higher settings (7-9) to increase stability and reduce sway.