FOX 987-24-032 2.5" HTO/IFP Shock for 2011-19 Chevy GMC 2500/3500HD Lifted 4-6"

Vehicle Fitment

• 2011-2019 Chevrolet Silverado 2500HD & 3500HD (2WD/4WD; gas or Duramax diesel)
• 2011-2019 GMC Sierra 2500HD & 3500HD (2WD/4WD; gas or Duramax diesel)

Fitment Notes

• Front shock only--designed for trucks with 4-6" suspension lift
• Not compatible with stock ride height or non-OEM upper/lower mounts
• Requires OEM bar-pin upper and clevis lower mounting style

Features

• 2.5" anodized alloy smooth-body shock with Type II clear plating
• Internal Floating Piston (IFP) isolates oil from nitrogen
• Hydraulic Top-Out (HTO) piston reduces harsh rebound at full compression
• Vehicle-specific valving tuned for lifted HD GM trucks
• Hard-chrome shaft for corrosion resistance and durability
• Fully rebuildable and re-tunable with FOX service centers
• Balanced ride for both on-road comfort and off-road control
• Includes mounting hardware for OEM bar-pin/clevis mount locations

Specifications

• Body Diameter: 2.5" (≈63 mm), anodized aluminum
• Extended Length: 21.85"; Compressed: 15.07"; Stroke: ~6.79"
• Mount: Bar-pin upper, clevis lower (front axle specific)
• Applicable Lift: 4" to 6" suspension lifts only
• Drivetrain: Compatible with both 2WD and 4WD GM HD trucks

Included Components

• 1x FOX 987-24-032 front smooth-body shock absorber
• Mounting bolt kit and bushings
• Installation instructions

Product Description

The FOX 987-24-032 Performance Series 2.5" smooth-body shock is engineered for lifted 2011-2019 Chevrolet Silverado and GMC Sierra 2500/3500HD trucks. Featuring IFP and HTO technology with precision tuning for 4-6" lift applications, it delivers benefits in recovery performance, damping consistency, and ride comfort.

Built from type II anodized 6061-T6 aluminum with hard-chrome shafts, this shock is serviceable and designed to dissipate heat efficiently. The Hydraulic Top-Out piston smooths harsh bottom-outs, while vehicle-specific valving balances ride control. With OEM-type mounting and rebuildable design, this front shock provides reliable upgrade performance for lifted HD GM platforms.