KYB KG54312 Suspension Shock Absorber - Rear

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

The KYB Gas-a-just KG54312 is a rear monotube shock absorber built for Ford F-150 and F-150 Heritage applications that need firmer control than a standard twin-tube design. It uses separate gas and oil chambers for quick response, consistent damping, and reduced fade during demanding driving.

Gas-a-just Product Line

KYB Gas-a-just shocks are tuned for trucks that work, tow, or run larger wheels and tires. The monotube design increases damping performance over OE shocks, while the high-pressure nitrogen gas chamber helps maintain ride control and steering response under load.

Key Features

• Fits 1997-2004 Ford F-150 and 2004 Ford F-150 Heritage, rear
• Adds up to 25% more damping performance over original equipment shocks
• Monotube construction separates gas and oil for fade-free operation and fast response
• Designed specifically for Ford F-150 rear suspension applications
• Triple chrome plated piston rod helps reduce seal wear and fluid leakage
• Supports vehicles used for towing, hauling, and heavier tire and wheel setups
• Dust cover included

Detailed Description

KYB KG54312 is engineered as a rear suspension shock absorber for 1997-2003 Ford F-150, 2004 Ford F-150 Heritage, and related rear applications listed for this part. The Gas-a-just monotube design uses an air-free hydraulic working area for control and a separate high-pressure nitrogen chamber for immediate damping demand, helping the shock react quickly when road conditions change. This part number, KG54312, is a direct-fit performance upgrade for drivers who want more controlled rear suspension behavior without changing the vehicle’s basic suspension layout.

This part cross-references Monroe Shocks & Struts 911132 for the same application.

What It Helps Address

• Excessive rear-end bounce over bumps and uneven pavement
• Reduced control when towing or carrying heavier loads
• Shock fade during repeated suspension movement
• Delayed steering response caused by worn rear damping
• Fluid leakage related to seal wear on aging shocks

Installation Notes and Tips

Install KG54312 in the rear position only and verify the mount style and compressed/extended length before installation. For 2004 Ford F-150 Heritage rear applications, follow manufacturer instructions when replacing the suspension strut and coil spring assembly. Always inspect related suspension components, fasteners, and bushings before completing the job.

Quality Assurance

KYB designs Gas-a-just shocks with monotube valving and high-pressure gas separation to maintain consistent damping performance. The triple chrome plated piston rod is used to help reduce seal wear and support long-term operation in demanding truck use.