FOX 2.5 Performance Series IFP Rear Shock for 2001–2010 GM 2500HD/3500HD

Restore predictable handling and eliminate bottoming out on loaded tailgates with a direct-mount 2.5-inch aluminum shock engineered for zero to one inch of lift on GMT800 chassis.

• Direct OEM Bracket Compatibility: Built exclusively for 2001–2010 Chevrolet and GMC Sierra 2500HD/3500HD platforms, bolting straight into factory upper and lower eyelet mounts without drilling, welding, or track-bar spacers.
• IFP Nitrogen Gas Isolation: An internal floating piston separates pressurized nitrogen from damping fluid to prevent aerated oil, ensuring consistent push-and-rebound pressure when navigating washboard gravel or pothole-riddled commutes.
• Scratch-Resistant Shaft Design: A 12mm hard-chromed rod topped with a fluoropolymer coating rides inside a dual-wall 7075-T6 aluminum shaft sleeve, blocking abrasive grit from scoring seals and extending maintenance intervals.
• Factory Geometry Preservation: Valving curves and bump stop tolerances mirror original equipment specifications, keeping your payload centered and preventing trailer sway without introducing a harsh, lifted-suspension ride.
• Rapid Thermal Management: Precision-machined 1-inch aluminum reservoir ports vent trapped heat faster than conventional tubular designs, stabilizing damping force across multi-hour hauls or steep grade descents where stock units overheat.
• Lightweight Space Conservation: Weighing just six pounds per unit with a 28-inch packaged length, each shock clears inner fender wells and leaf springs without requiring trim removal or crossmember modifications.