FOX 2.5 Performance Smooth Body HTO 4-6″ Front Lift IFP Shocks for 2011-2019 GMC Sierra 3500HD

Description
FOX 2.5 Performance Smooth Body HTO 4-6″ Front Lift IFP Shocks for 2011-2019 GMC Sierra 3500HD

FOX 2.5 Performance Smooth Body HTO 4-6 inches Front Lift IFP Shocks for 2011-2019 GMC Sierra 3500HD

Part Number: 987-24-032

Summary: The FOX 2.5 Performance Series HTO shocks are engineered to provide a significant upgrade in damping capacity for the GMC Sierra 3500HD. Featuring an Internal Floating Piston (IFP) and a larger 2.5-inch aluminum body, these shocks are designed to manage heat and improve ride quality both on and off-road. The integration of Hydraulic Top Out (HTO) technology addresses the specific challenges of lifted applications by providing position-sensitive rebound control to eliminate harsh top-outs.

Features

• Internal Floating Piston (IFP): The internal floating piston (IFP) separates shock oil from high-pressure nitrogen to provide optimized damping and consistent performance.
• Hydraulic Top Out (HTO): A secondary shim stack provides position-sensitive rebound damping to ensure reduced harshness and increased comfort during full extension.
• 6061-T6 Aluminum Body: A 2.5-inch impact extruded aluminum body with Type II clear-anodized plating provides efficient heat dissipation to ensure corrosion resistance.
• High-Flow Velocity-Sensitive Damping: Vehicle-specific valving provides rapid response to terrain changes to ensure improved vehicle control.

Technical Specifications

Fitment

• 2011-2019 GMC Sierra 3500HD
• Note: Lift: 4-6 inches. Not For Use With Lift Kits That Change OE Mounts.

What’s Included

• Includes 2 Shocks

Why Choose This Product?

• Engineering Advantage: The combination of a large 2.5-inch diameter body and Internal Floating Piston (IFP) technology allows for greater oil capacity and thermal stability compared to standard designs.
• Performance Benefit: Drivers experience a smoother, more controlled ride with specific protection against harsh topping out, especially when running heavier aftermarket tires.

Frequently Asked Questions

What is the benefit of Hydraulic Top Out (HTO) technology?
HTO technology provides position-sensitive rebound damping by forcing oil through a secondary shim stack, which slows down the shock shaft speed to reduce harsh top-outs.

Are these shocks compatible with all lift kits?
These shocks are designed for vehicles with 4-6 inches of front lift but are not for use with lift kits that change the original equipment (OE) mounts.

How does the Internal Floating Piston (IFP) improve performance?
The IFP separates the shock oil from the high-pressure nitrogen gas, which prevents oil aeration and allows the shock to provide consistent, fade-free damping.