KYB 554347 Shock Absorber - Front

KYB Gas-a-Just Front Shock for Super Duty

The KYB Gas-a-Just 554347 is a front suspension shock absorber built for Ford Super Duty trucks that need firmer control and consistent response. Its monotube design separates gas and oil to reduce fade, improve steering response, and maintain damping performance under load.

Key Features

• Monotube shock design with separate gas and oil chambers for fade-resistant operation
• Up to 25% more damping performance than original equipment shocks
• High-pressure nitrogen gas helps deliver quick response during braking, cornering, and load changes
• Triple chrome plated piston rod helps reduce seal wear and fluid leakage
• Designed for Ford Super Duty trucks that tow, work, or run larger tires and wheels
• Dust cover included
• Lower mount type: E2(14.6X42); upper mount type: S1(12MM)

Detailed Description

KYB Gas-a-Just shocks are engineered for drivers who want more control than a conventional twin-tube design can provide. The 554347 uses a high-pressure monotube layout with an air-free hydraulic working area and a separate nitrogen gas chamber, allowing the shock to react quickly while maintaining a comfortable ride in normal driving. This design is well suited to Ford F-250 Super Duty and Ford F-350 Super Duty front suspension applications where towing, payload, and larger wheel-and-tire setups place extra demand on the suspension. This part number, 554347, is a direct-fit front shock absorber for multiple Super Duty configurations and is also cross-referenced to Monroe Shocks & Struts 911266 for the same application.

What It Helps Address

• Excessive front-end bounce after bumps or dips
• Reduced steering response during braking or lane changes
• Shock fade from heat buildup in demanding driving conditions
• Loss of control when towing or carrying heavy front-end loads
• Premature seal wear related to fluid leakage

Installation Notes and Fitment

Compatible With Ford F-250 Super Duty and Ford F-350 Super Duty front suspension applications. Fits 2023-2025 Ford F-350 Super Duty, front, w/o Tremor Package; Gas-a-just. Fits 2022-2024 Ford F-250 Super Duty, front, w/o Off Road Suspension; Gas-a-just. Fits 2021-2022 Ford F-350 Super Duty, front, w/ Dual Rear Wheels; Gas-a-just. Fits 2005-2021 Ford F-250 Super Duty, front; Gas-a-just. Fits 2005-2020 Ford F-350 Super Duty, front; Gas-a-just. Fits 2017-2019 Ford F-350 Super Duty, front, w/ Dual Rear Wheels; Gas-a-just. Fits 2011-2017 Ford F-250 Super Duty, front, w/ Off Road Suspension; Gas-a-just. Verify mount style and suspension configuration before installation. The compressed length is 13.39 in., extended length is 20.71 in., and stroke length is 7.32 in.

Quality Assurance

KYB designs Gas-a-Just shocks with monotube valving and high-pressure gas separation to support consistent damping performance and steering response. The construction is intended to help maintain suspension behavior as the vehicle manufacturer designed it, including systems that rely on stable suspension, braking, and tire contact.