Sierra 2500HD/3500HD 2011-2019 GMC 4wd (w/1.5-3.5" lift / Set of 4) - Fox 2.5 Performance Series IFP HTO Shock (FRONT & REAR)

Upgrade your GMC Sierra 2500HD / 3500HD with this set of four Fox 2.5 Performance Series Smooth Body HTO Shocks, designed for both front and rear. This kit includes the FOX 987-24-031 and 987-24-011 shock absorbers, providing your truck with the ultimate on-road comfort and off-road performance.

Built with position-sensitive technology and vehicle-specific valving, these shocks deliver outstanding damping control for a smoother, more controlled ride. The 2.5-inch diameter, 6061-T1 anodized aluminum body resists corrosion and efficiently dissipates heat, making it ideal for rigorous conditions. An internal floating piston (IFP) separates shock oil from high-pressure nitrogen, ensuring consistent damping performance under varying loads and speeds. Equipped with Hydraulic top-out (HTO) technology, these shocks reduce harsh top-outs and improve rebound control, an essential feature for trucks with aggressive tires and non-OEM lifts. The secondary shim stack within the shock slows shaft speed to deliver a smooth rebound, enhancing comfort and handling across diverse terrains.

Features & Benefits:

• Large 2.5-inch impact-extruded 6061-T6 aluminum shock body
• Increased size improves oil capacity and dampening capabilities
• Hydraulic Top Out (HTO) piston reduces harsh top-out and enhances ride comfort
• Excellent performance for on and off-road
• Type II clear-anodized body plating
• High-flow velocity-sensitive damping
• 5/8” hard chrome shaft
• Internal floating piston (IFP)
• Corrosion resistant finish
• Application specific tune
• Fully rebuildable and re-tunable
• Bolt-on installation

Front Shock Specs:

• Extended length: 19.350 inches
• Compressed length: 13.770 inches
• Travel: 5.590 inches
• Top mount: Bar Pin
• Bottom mount: Clevis
• Axle: Front
• Fits models with 1.5 to 3.5 inches of suspension lift

Rear Shock Specs:

• Extended length: 26.720 inches
• Compressed length: 17.540 inches
• Travel: 9.180 inches
• Top mount: Eyelet
• Bottom mount: Eyelet
• Axle: Rear
• Fits models with 1.5 to 2.5 inches of suspension lift