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

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

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

Part Number: 987-24-035

Summary: The FOX 2.5 Performance Series HTO shocks are engineered to provide a significant upgrade in damping capacity for vehicles with 4-6 inches of rear lift. These shocks utilize an Internal Floating Piston (IFP) to separate shock oil from high-pressure nitrogen, ensuring consistent performance by preventing oil aeration. Designed with Hydraulic Top Out (HTO) technology, they deliver position-sensitive rebound control to manage the added mass of larger, aggressive tires on and off the pavement.

Features

• Internal Floating Piston (IFP): The internal floating piston (IFP) architecture separates shock oil from the high-pressure nitrogen gas to provide optimized damping and consistent performance.
• Hydraulic Top Out (HTO): A secondary shim stack in the HTO piston provides position-sensitive rebound damping to ensure reduced harsh top-outs and increased comfort.
• 6061-T6 Aluminum Body: An impact-extruded 2.5-inch aluminum shock body provides efficient heat dissipation and corrosion resistance to ensure long-term durability.
• 5/8 inches Hard Chrome Shaft: A 5/8-inch hard chrome plated heat-treated alloy steel shaft provides increased strength to ensure reliable operation under load.

Technical Specifications

Fitment

• 2011-2019 GMC Sierra 3500HD
• Note: Designed for vehicles with 4-6 inches of rear lift.

What’s Included

• Includes 2 Shocks

Why Choose This Product?

• Engineering Advantage: These shocks feature a larger 2.5-inch aluminum body and Hydraulic Top Out (HTO) technology, which offers superior heat management and position-sensitive damping compared to standard shock designs.
• Performance Benefit: Drivers experience improved ride quality and reduced harshness, specifically when managing the rebound forces associated with lifted suspensions and heavier aftermarket tires.

Frequently Asked Questions

What is the benefit of the HTO technology in these shocks?
Hydraulic Top Out (HTO) technology reduces harsh top-outs by slowing down the shock shaft speed through a secondary shim stack, which is especially helpful for lifted applications with heavier tires.

Does this shock require special mounting hardware?
These are bolt-on shocks designed with eyelet mounts for both the top and bottom, utilizing OE-style mounting locations for a straightforward installation.

How does the IFP design improve performance?
The Internal Floating Piston (IFP) separates the oil from the nitrogen gas, which prevents oil foaming and aeration to ensure the damping remains consistent during aggressive use.