GMC Sierra 3500 HD Shock Absorber - FOX - 2.5 Performance Series Smooth Body IFP HTO - `11-`25 is a direct-fit performance shock engineered for heavy-duty Sierra platforms from 2011 through 2025. It provides improved drop-out travel for off-road use while maintaining composed on-road behavior through vehicle-specific valving.

This FOX 2.5 Performance Series smooth body shock combines a 2.5" impact-extruded 6061-T6 aluminum body with a race-developed main piston and a true internal floating piston (IFP) to keep gas and oil separated. The Hydraulic Top-Out (HTO) piston controls rebound top-out forces for more predictable movement, and high-flow velocity-sensitive damping gives controlled response across a wide range of terrain. Type II clear-anodized plating and a 5/8" hard chrome shaft provide corrosion resistance and long service life. These shocks are fully serviceable and re-tunable for owners who want to maintain or adjust performance over time.

Features

• 2.5" impact-extruded 6061-T6 aluminum smooth body
• Internal Floating Piston (IFP) to separate gas and oil
• Hydraulic Top-Out (HTO) piston for controlled rebound
• Application-specific valving for on-road comfort and off-road control
• 5/8" hard chrome shaft and Type II clear-anodized finish
• High-flow, velocity-sensitive damping; fully serviceable and re-tunable

If you have questions or want help selecting the right setup for your Sierra, call us directly — we can walk through fitment and options. We offer installation and customization services at our two locations in Austin, Texas and the Los Angeles, California area. Call Austin: 512-982-9393 (TX) or Los Angeles area: 562-981-6800 (CA). If you are considering purchasing multiple items, please contact us for shipping discounts. We install on premises at both locations.

CA Residents: WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov