
2011-2025 Duramax Rear 2.5 HTO Performance Series Single Shock 0-1" (KRS4009)
Description
Fits
| Year | Make | Model |
| 2011-2025 | Chevrolet/GMC | 2500HD/3500HD |
Fox direct replacement shocks deliver race-winning performance in a simple, bolt-on package. These Performance Series 2.5 shocks feature FOX's innovative Hydraulic Top Out (HTO) technology, providing position-sensitive rebound damping control. By utilizing a secondary shim stack to slow down shock shaft speed, HTO significantly reduces harsh top-outs and increases overall ride comfort. This is particularly beneficial for heavy-duty trucks equipped with heavier, more aggressive tires or those lifted above OEM specifications.
*Sold Individually
Part Number: KRS4009
Features
- Hydraulic Top Out provides superior rebound damping
- Prevents harsh suspension "clunk" at full extension
- Increased oil capacity reduces heat fade during heavy towing or off-road use
- Engineered by Fox to fit 2011+ GM HD mounting locations without modification
- Designed to maximize suspension travel and control on and off the pavement
- Withstands the demands of the Chevrolet and GMC 2500HD/3500HD chassis
Shock Specs:
- Collapsed (in): 17.34"
-
Extended (in): 26.02"
Includes
- 1 x Rear Fox 2.5 HTO Performance Series Shock
Notes
-
Sold Individually.
- Designed for rear axle fitment on stock to slightly lifted applications.
Original: $253.75
-65%$253.75
$88.81Product Information
Product Information
Shipping & Returns
Shipping & Returns
Description
Description
Fits
| Year | Make | Model |
| 2011-2025 | Chevrolet/GMC | 2500HD/3500HD |
Fox direct replacement shocks deliver race-winning performance in a simple, bolt-on package. These Performance Series 2.5 shocks feature FOX's innovative Hydraulic Top Out (HTO) technology, providing position-sensitive rebound damping control. By utilizing a secondary shim stack to slow down shock shaft speed, HTO significantly reduces harsh top-outs and increases overall ride comfort. This is particularly beneficial for heavy-duty trucks equipped with heavier, more aggressive tires or those lifted above OEM specifications.
*Sold Individually
Part Number: KRS4009
Features
- Hydraulic Top Out provides superior rebound damping
- Prevents harsh suspension "clunk" at full extension
- Increased oil capacity reduces heat fade during heavy towing or off-road use
- Engineered by Fox to fit 2011+ GM HD mounting locations without modification
- Designed to maximize suspension travel and control on and off the pavement
- Withstands the demands of the Chevrolet and GMC 2500HD/3500HD chassis
Shock Specs:
- Collapsed (in): 17.34"
-
Extended (in): 26.02"
Includes
- 1 x Rear Fox 2.5 HTO Performance Series Shock
Notes
-
Sold Individually.
- Designed for rear axle fitment on stock to slightly lifted applications.



















