FOX 987-24-009 2.5 Performance Series IFP HTO Rear Shock 0-1" Lift | 2011-2025 GM Sierra/Silverado 2500HD/3500HD

Features:

• Supports 0-1" rear lift height
• Hydraulic Top Out smooths rebound motion
• 2.5" aluminum body dissipates heat efficiently
• Internal Floating Piston enhances shock control
• Ideal for trucks with larger tires
• Type II anodized finish resists corrosion
• 5/8" hard chrome shaft increases durability
• Position-sensitive damping for improved comfort
• Delivers 8.68 inches of shock travel
• Bolt-on installation for easy upgrade
• Application-specific tuning for GM HD trucks
• Eyelet mounts on both ends for secure fit

Built To Handle Every Mile You Throw At It

If you’re tired of feeling every bump and jolt in the road, the FOX 2.5 Performance Series IFP HTO Rear Shock might be the upgrade your GM 2500HD or 3500HD has been waiting for. This rear shock is built for real-world performance, whether you're towing, hauling, or hitting some backroad trails. It’s made for trucks with a mild lift and delivers noticeable improvements in comfort and control right away. The Hydraulic Top Out technology is a game changer if you’ve added heavier tires, keeping the rear end from bouncing or topping out during full extension. That means fewer harsh rebounds and a smoother, more composed ride, no matter the terrain. Plus, the anodized aluminum body doesn’t just resist rust, it gives your truck a sleek, upgraded look. When you're pushing your truck daily, this shock keeps your ride stable, responsive, and a whole lot more comfortable.

Tuned For Precision Damping On And Off Road

Engineered to match the demands of the 2011-2025 GM Sierra and Silverado HD platforms, the FOX 987-24-009 rear shock is packed with high-performance features. At the center of its design is a 2.5-inch 6061-T6 aluminum body, impact-extruded and Type II anodized to resist corrosion and dissipate heat. This large shock body increases oil volume, which translates into better cooling and more consistent damping over long hauls or rough terrain. An Internal Floating Piston (IFP) keeps the nitrogen and oil separate, preventing fade and delivering stable performance. The Hydraulic Top Out piston adds position-sensitive rebound control, easing the shock’s extension when your rear suspension maxes out. With 8.68 inches of travel and eyelet mounts on both ends, it fits cleanly into place and holds up to demanding loads. This shock is vehicle-specific tuned, fully rebuildable, and ready for anyone who expects more from their truck's suspension.

Fits: 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022, 2023, 2024, 2025 GM Sierra 2500HD/3500HD

Notes:

• Sold individually; purchase two for full rear replacement
• Designed for 2011–2025 GM 2500HD/3500HD with 0–1" rear lift
• Hydraulic Top Out (HTO) technology reduces harsh top-outs
• Ideal for trucks with heavier, aggressive tires
• Fully rebuildable and re-tunable for long-term use
• Vehicle-specific valving ensures optimal performance
• Eyelet top and bottom mounts; verify compatibility
• Provides 8.68 inches of shock travel
• Internal Floating Piston (IFP) separates oil and gas
• Type II anodized aluminum body resists corrosion
• High-flow design enhances shock responsiveness
• Installation requires standard hand tools; no drilling needed

Install Instructions