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

Proprietary internal floating piston design and a 10N3 valving profile deliver consistent, fade-resistant damping across demanding trails and daily highway commutes without requiring chassis modifications.

• Machined 6061-T6 Aluminum Monotube Body: The precision-machined 2.5‑inch outer tube sheds heat rapidly during sustained compression cycles, preventing fluid foaming and valve collapse that standard twin-tube shocks suffer under heavy loads.
• Nitrogen-Charged ISPD Separation System: An isolated floating piston keeps high-pressure nitrogen physically separated from the hydraulic fluid, ensuring neutral buoyancy and predictable rebound stroke even when ambient temperatures fluctuate sharply.
• Hardened 4130 Chromoly Piston Rod: A 0.43‑inch racing-spec shaft resists bending and surface scoring compared to mild steel alternatives, extending bearing life and minimizing maintenance windows between professional rebuilds.
• Direct OE Fitment for Heavy-Duty Trucks: CNC-measured to match factory mounting eye centers, this unit installs into 2001–2010 Chevy and GMC 2500HD/3500HD frames with zero cutting or aftermarket bracket swaps, preserving critical caster and camber angles.
• Threaded Preload & Adjustable Travel Position: Quickly dial in ride height from zero to 2.5 inches using the precision thread collar, allowing clean clearance for aggressive tire diameters or additional payload without compromising steering linkage geometry.
• Streamlined Packaging & Freight-Safe Dimensions: Each shock arrives fully assembled and nitrogen-pressurized at just 6 pounds net weight, housed in a 28 x 5 x 4 inch carton sized to bypass dimensional weight surcharges while protecting threads and seals during transit.