FOX 987-24-035 Fox 2.5 Performance Series IFP HTO Rear Shock w/ 4-6" Lift | 2011-2025 GM Sierra/Silverado 2500HD/3500HD

Features:

• Fits 2011–2025 GM 2500HD/3500HD trucks
• Supports 4 to 6 inches of rear lift
• 2.5" aluminum body for heat management
• Type II anodized finish resists corrosion
• Internal Floating Piston (IFP) for consistent damping
• Hydraulic Top Out (HTO) smooths rebound control
• Ideal for aggressive tires and off-road loads
• 5/8" hard chrome shock shaft for durability
• High-flow valving improves ride and control
• Extended 10.39" travel for greater articulation
• Eyelet mounts ensure secure factory-style fitment
• Vehicle-specific tuning for optimized rear handling

Upgrade Your Rear Suspension For The Long Haul

If your GM HD truck is sitting on a 4 to 6 inch rear lift, you need a shock that keeps up with every mile, bump, and load, and the FOX 2.5 Performance Series IFP HTO rear shock is built to do just that. Designed to handle the increased travel and added stress of a lifted setup, this bolt-on upgrade brings comfort and control back to your ride. It delivers noticeably smoother handling both on pavement and over rough terrain, making it a great match for daily drivers, weekend warriors, and workhorse rigs alike. The Hydraulic Top Out feature kicks in during full extension, softening the harsh rebound you often feel with taller lifts or heavy-duty tires. That added control goes a long way in maintaining a stable, comfortable ride when your truck is working hard. Whether you're towing, hauling, or heading off the beaten path, this shock keeps your rear end planted and predictable. Plus, it's built with premium materials that hold up under extreme use, so you can trust it to perform wherever the road leads.

Designed To Match Heavy Duty Lifted Performance

The FOX 987-24-035 rear shock is engineered specifically for 2011–2025 Silverado and Sierra 2500HD and 3500HD trucks with 4 to 6 inches of rear lift. It features a 2.5-inch impact-extruded aluminum body that boosts oil capacity and manages heat efficiently, even under heavy towing or off-road stress. The Type II clear-anodized finish provides corrosion resistance, helping the shock maintain its durability in wet, salty, or dusty conditions. An internal floating piston separates the nitrogen and shock oil to ensure consistent damping across varying terrain and loads. The Hydraulic Top Out piston plays a key role in smoothing rebound near full extension, especially helpful when the suspension is unloaded or under hard articulation. With 10.39 inches of travel, it offers generous movement for off-road scenarios and big rear-end articulation. The 5/8-inch hard chrome shaft and vehicle-specific tuning give this shock the strength and responsiveness needed for high-performance lifted applications. Mounted using eyelet ends at both top and bottom, it fits securely into stock-style locations for an easy, reliable installation.

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

Notes:

• Compatible with 2011–2025 GM 2500HD/3500HD trucks
• Designed for 4–6 inch rear suspension lifts
• Not compatible with lift kits altering OE mounts
• Sold individually; purchase two for both rear wheels
• Ideal for trucks with larger, heavier tires
• Direct bolt-on installation; no modifications needed
• Hydraulic Top Out (HTO) enhances rebound control
• Internal Floating Piston (IFP) maintains damping consistency
• Aluminum body efficiently dissipates heat
• Type II anodized finish resists corrosion
• 5/8" hard chrome shaft offers durability
• Vehicle-specific valving ensures optimal performance
• Fully rebuildable and re-tunable for longevity

Install Instructions