The RS994310 is a rear shock absorber from Rancho’s RS9000XL series, engineered specifically for the 2006–2010 Hummer H3 and 2009–2010 Hummer H3T when equipped with Rancho’s RS6558B 4-inch rear suspension lift system. This unit delivers 9-position adjustable damping, letting drivers dial in their preferred ride character from trail-ready stiff to daily-driver comfort without removing the shock from the vehicle.
Rancho RS9000XL 9-Position Adjustable Performance
Rancho’s RS9000XL platform uses a triple-tube design that separates the working, reserve, and outer tubes to maintain consistent fluid volume and pressure across the full range of suspension travel. The RS994310 is gas-charged and calibrated for the increased suspension geometry and additional weight loading produced by a 4-inch lift. Adjustments are made via the external adjuster knob at the top of the shock body: position 1 provides the softest, most compliant ride for highway cruising, while position 9 firms up damping for aggressive off-road driving or loaded towing. All nine settings are accessible in seconds without special tools.
Built for the Rancho RS6558B 4-Inch Lift System
The RS994310 is not a direct stock-height replacement. It is purpose-built for installation alongside the Rancho RS6558B 4-inch rear lift kit. The shock’s extended length of 26.63 inches and compressed length of 17.75 inches match the increased ride height and revised suspension geometry of that lift system. Running this unit on a stock-height H3 will produce incorrect suspension travel, potential frame contact, and unsafe handling. Always pair the RS994310 with the RS6558B lift as Rancho specifies.
Construction and Hardware Details
The RS994310 features a 2.750-inch diameter shock body machined from high-strength steel with a red polyurethane protective boot to shield the piston rod from trail debris, mud, and water intrusion. The upper mount uses a T-bar configuration and the lower mount uses a threaded eyelet, both supplied with polyurethane bushings that maintain precise alignment and reduce noise and vibration transfer into the chassis. All mounting hardware is included.
What’s Included
- 1 x Rancho RS994310 RS9000XL rear shock absorber
- Polyurethane bushings (upper and lower)
- Mounting hardware
- Red protective boot
- Rancho installation instruction sheet
Vehicle Fitment
The RS994310 fits the following vehicles when equipped with the Rancho RS6558B 4-inch rear lift system. All individual model years and trims are listed below. Verify your specific configuration before ordering.
| Year | Make | Model | Trim |
|---|---|---|---|
| 2006 | Hummer | H3 | Base |
| 2006 | Hummer | H3 | Luxury |
| 2006 | Hummer | H3 | Adventure |
| 2007 | Hummer | H3 | Base |
| 2007 | Hummer | H3 | X |
| 2007 | Hummer | H3 | Luxury |
| 2007 | Hummer | H3 | Adventure |
| 2008 | Hummer | H3 | Base |
| 2008 | Hummer | H3 | X |
| 2008 | Hummer | H3 | Luxury |
| 2008 | Hummer | H3 | Adventure |
| 2009 | Hummer | H3 | Base |
| 2009 | Hummer | H3 | X |
| 2009 | Hummer | H3 | Alpha |
| 2009 | Hummer | H3 | Luxury |
| 2009 | Hummer | H3 | Adventure |
| 2009 | Hummer | H3 | Championship Series |
| 2009 | Hummer | H3T | Base |
| 2009 | Hummer | H3T | Alpha |
| 2010 | Hummer | H3 | Base |
| 2010 | Hummer | H3 | X |
| 2010 | Hummer | H3 | Alpha |
| 2010 | Hummer | H3 | Luxury |
| 2010 | Hummer | H3 | Adventure |
| 2010 | Hummer | H3 | Championship Series |
| 2010 | Hummer | H3T | Base |
| 2010 | Hummer | H3T | Alpha |
Important: This shock requires the Rancho RS6558B 4-inch rear lift system. It will not fit a stock-height H3 or H3T.
Product Specifications
| Specification | Value |
|---|---|
| Manufacturer Part Number (MPN) | RS994310 |
| Series | RS9000XL |
| Position | Rear |
| Extended Length | 26.63 in |
| Compressed Length | 17.75 in |
| Body Diameter | 2.750 in |
| Design | Triple-tube, gas-charged |
| Damping Positions | 9 |
| Upper Mount Type | T-bar |
| Lower Mount Type | Eyelet |
| Bushing Material | Polyurethane |
| Boot Color | Red |
| Required Lift Kit | Rancho RS6558B (4-inch rear lift) |
| Warranty | Rancho Limited Lifetime Warranty |
| UPC | 039703093101 |
Frequently Asked Questions
Will the RS994310 fit my 2008 Hummer H3 with a stock suspension?
No. The RS994310 is designed exclusively for use with the Rancho RS6558B 4-inch rear lift system. Installing this shock on a stock-height vehicle will cause the shock to bottom out or overextend, leading to handling problems and potential frame damage.
What does the 9-position adjustment on the RS994310 actually change?
The adjuster dial controls compression and rebound damping force. At position 1, the shock valving is softer, allowing the suspension to move more freely. At position 9, the valving stiffens significantly, reducing body roll and limiting unwanted suspension movement during aggressive cornering, towing, or rock-crawling.
Do I need to buy shocks in pairs?
Rancho and most suspension professionals recommend replacing shocks in axle pairs. Installing one new shock on one side and leaving the original worn shock on the other creates imbalanced damping across the axle. Two units of RS994310 are needed for a complete rear axle installation.
What lift kit does the RS994310 require?
The RS994310 is specifically engineered to work with the Rancho RS6558B 4-inch rear suspension lift system for the Hummer H3 and H3T. Using this shock with a different brand’s 4-inch lift or a lift of a different height may result in incorrect travel or mount interference.
How long does it take to change the damping adjustment setting while on the trail?
The external adjuster on the RS994310 requires no tools and no removal of the shock. Simply reach down to the top of the shock body and rotate the knob to the desired position. The full range from position 1 to position 9 takes only a few seconds.
Is the RS994310 compatible with the 2009 or 2010 Hummer H3T pickup?
Yes. The RS994310 fits the 2009 H3T Base and Alpha trims as well as the 2010 H3T Base and Alpha trims, provided those vehicles are equipped with the Rancho RS6558B 4-inch lift system.
What is the Rancho Limited Lifetime Warranty and what does it cover?
Rancho backs the RS994310 with a Limited Lifetime Warranty to the original retail purchaser against defects in materials and workmanship. Under the Magnuson-Moss Warranty Act, Rancho is required to make the full terms of this warranty available to you before purchase.
Does the RS994310 come with all the hardware needed for installation?
Yes. The RS994310 ships with polyurethane bushings for both the upper T-bar mount and the lower eyelet mount, along with the necessary mounting hardware and the red protective boot.
What is the red boot on the RS994310 for?
The red polyurethane boot shields the exposed portion of the piston rod from trail debris, mud, gravel, and moisture. A scored or pitted rod caused by debris contact will accelerate seal wear and lead to fluid leakage.
California Proposition 65 Warning
WARNING: This product can expose you to chemicals including lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information, go to www.p65warnings.ca.gov.
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