GMC Sierra 2500 HD Shock Absorber - FOX - 2.5 Performance Series Smooth Body IFP HTO - `11-`25. A vehicle-specific, performance-minded shock built to improve both on-road control and off-road capability for 2011–2025 Sierra 2500 HD models.

This FOX 2.5 Performance Series smooth body IFP HTO shock uses application-specific valving and race-developed components to provide predictable damping, reduced vehicle sway, and extended drop-out travel in many setups. The design separates gas and oil with a true internal floating piston (IFP) and includes a hydraulic top-out (HTO) piston to control high-speed shaft movement. Constructed from impact-extruded 6061-T6 aluminum with Type II clear-anodized plating, the body dissipates heat efficiently; a 5/8" hard chrome shaft and corrosion-resistant finishes keep the unit serviceable and durable. Performance Series shocks are fully rebuildable and re-tunable for enthusiasts who want to dial in ride characteristics.

Features

• 2.5" impact-extruded 6061-T6 aluminum smooth body
• True Internal Floating Piston (IFP) to separate gas and oil
• Hydraulic Top-Out (HTO) piston for controlled high-speed extension
• Application-specific damping valving and high-flow velocity-sensitive damping
• 5/8" hard chrome shaft; Type II clear-anodized plating; fully rebuildable

If you have questions or want help choosing the right setup, call us directly — we’re happy to advise. Installation and customization services are available at our two locations in Austin, Texas and the Los Angeles, California area. Call: 512-982-9393 (TX), 562-981-6800 (CA). If you're considering purchasing multiple items, contact us for shipping discounts. We install on premises at both locations.

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