KYB KG54314 Shock Absorber - Rear

KYB Gas-a-just Rear Shock for Ford F-150

The KYB Gas-a-just KG54314 is a rear monotube shock absorber built for Ford F-150 applications that need firmer control than a standard OE-style shock. It is designed for 1997-2003 Ford F-150 and 2004 Ford F-150 Heritage rear fitments, excluding the Off-Road Package and 7700 GVW Package applications listed below.

Gas-a-just Performance Line

KYB Gas-a-just shocks use a monotube design with separate gas and oil chambers for quick response and fade-resistant operation. The Gas-a-just line is aimed at trucks that work, tow, or run larger tires and wheels, and this KG54314 rear shock adds up to 25% more damping performance over original equipment shocks.

• Rear shock absorber for Ford F-150 and Ford F-150 Heritage applications
• Monotube design separates gas and oil for consistent damping response
• High-pressure nitrogen gas helps maintain control during repeated suspension movement
• Triple chrome plated piston rod helps reduce seal wear and fluid leakage
• Valving and components are tuned specifically for Ford F-150 fitment
• Supports steering response and suspension control under load
• Dust cover included

Detailed Product Overview

Part number KG54314 is engineered as a rear suspension shock absorber for 1997-2003 Ford F-150 and 2004 Ford F-150 Heritage models. The monotube construction uses an air-free hydraulic working area for responsiveness and a separate high-pressure nitrogen chamber for stable ride control, which helps the shock react quickly when the truck is carrying weight, towing, or operating with heavier wheels and tires. This KYB Gas-a-just rear shock for Ford F-150 applications is also designed to support the suspension behavior that electronic safety systems expect from the vehicle.

This part cross-references Monroe Shocks & Struts (e.g., 911521) for the same application.

What This Shock Helps Address

• Excessive rear-end bounce after bumps or dips
• Reduced control when towing or hauling
• Soft or delayed suspension response compared with OE damping
• Shock fade from repeated suspension cycling
• Seal wear that can contribute to fluid leakage

Installation Notes and Fitment

Fits 2004 Ford F-150 Heritage, rear, monotube performance upgrade; excludes Off-Road Package and 7700 GVW Package. Fits 1997-2003 Ford F-150, rear, monotube performance upgrade; excludes 7700 GVW Package. Confirm compressed length of 16.26 in., extended length of 26.85 in., stroke length of 10.59 in., lower mount type E2(12X38), and upper mount type S1 before installation. The dust cover is included, and the shock uses an R-stop configuration.

Quality Assurance

KYB designs Gas-a-just shocks as monotube performance dampers with application-specific valving for truck use. Part number KG54314 is built to match the listed Ford F-150 rear applications and to maintain consistent damping response under demanding driving conditions.