FOX 987-24-025 2.5 Performance Series IFP HTO Rear Shock w/ 6.5" Lift | 2020-2025 GM Sierra/Silverado 2500HD/3500HD

Features:

• Built for 6.5" rear lift systems
• 2.5" impact-extruded aluminum shock body
• Type II clear-anodized corrosion protection
• Internal Floating Piston design boosts control
• Hydraulic Top Out improves rebound comfort
• Great for trucks with heavier tires
• High-flow velocity-sensitive damping response
• 5/8" hard chrome-plated shaft
• Position-sensitive rebound for better handling
• Direct bolt-on installation for lifted trucks
• Reduces harsh top-out impacts on road
• Designed specifically for GM HD trucks

Drive Harder With Comfort You Can Feel

If you’ve lifted your 2020-2025 Silverado or Sierra 2500HD/3500HD and added more aggressive tires, the FOX 987-24-025 rear shock is exactly what your truck needs to handle the extra demand. This shock is all about combining strength with ride comfort, giving you the confidence to push harder both on and off the road. Thanks to FOX’s Hydraulic Top Out technology, you won’t get that harsh jolt at full rebound like you do with lesser shocks. Instead, it slows the return of the shock shaft just enough to keep things controlled and smooth, especially when hitting dips, ruts, or even speed bumps. It’s also a great match for trucks that haul gear or trailers, keeping the rear end stable without bouncing around. The bolt-on design means no headaches during installation, and once they’re in, you’ll notice the difference right away. Whether you're chasing trails or hauling heavy loads, these rear shocks deliver serious comfort, control, and capability every mile of the way.

Purpose Built To Handle Lifted Demands

FOX designed the 987-24-025 Performance Series IFP HTO rear shock to meet the unique challenges of 6.5-inch lifted GM HD trucks. The 2.5-inch impact-extruded 6061-T6 aluminum body is lightweight, strong, and coated in a Type II clear anodized finish that holds up against corrosion in all seasons. Inside, the high-flow, velocity-sensitive damping system adapts to road and terrain conditions in real time, offering a ride that’s both responsive and predictable. The Internal Floating Piston (IFP) keeps oil and nitrogen separated for consistent damping without cavitation, even during hard use. The 5/8-inch hard chrome shaft provides long-term durability, and the position-sensitive Hydraulic Top Out piston helps reduce rebound harshness without sacrificing control. This becomes especially important with oversized tires or when carrying extra weight in the bed. Built for serious use and fine-tuned for comfort, this shock isn’t just compatible with lifted setups, it’s made to perform with them.

Fits: 2020, 2021, 2022, 2023, 2024, 2025 GM Sierra/Silverado 2500HD/3500HD

Notes:

• Designed for 2020-2025 Silverado and Sierra 2500HD/3500HD
• Engineered for vehicles with a 6.5" rear lift
• Optimized for use with aggressive oversized tires
• Hydraulic Top Out reduces harsh rebound impacts
• Great for lifted trucks carrying extra weight or gear
• Direct bolt-on installation with no major modifications required
• Best paired with matching front shocks for balanced handling
• Not compatible with stock height or lower lift setups
• Aluminum body resists corrosion in all driving environments
• Designed to improve both off-road and highway ride quality
• Professional installation recommended for proper suspension tuning

Install Instructions