KYB Suspension Shock Absorber P/N:555056

Control body motion at the rear of your Super Duty with the KYB Gas-a-just, a high-pressure monotube KYB shock absorber (MPN 555056). This REAR-position gas shock drops in as a direct-fit replacement for the 2005-2016 Ford F-250 Super Duty, 2008-2016 Ford F-350 Super Duty, and 2011-2016 Ford F-450 Super Duty — see the Buyer's Guide tab for engine-level details. Its components and valving are designed specifically for Super Duty Ford trucks.

• Monotube gas design: The high-pressure monotube separates the gas and oil so the shock resists fade from aeration and responds instantly, unlike a traditional twin-tube design.
• Two working chambers: An air-free hydraulic piston and valve area handles responsiveness and control, while a high-pressure nitrogen gas area with a floating piston supports a comfortable ride during normal driving.
• Triple chrome-plated piston rod: Because fluid leaking can cause shock failure, the ultra-smooth rod is designed to reduce seal wear.
• Extra damping for work duty: Adds up to 25% more damping performance over original equipment shocks — designed for trucks that work, tow, and run larger, heavier tires and wheels. The higher gas pressure helps improve steering response and helps keep Electronic Safety Systems performing as designed.

Signs a worn rear shock may need replacing include excessive bouncing, poor control over bumps, or fluid leaking from the shock body.

Interchange: 5C3Z18125A · 6C3Z18125KBA · 77952 · 911267