Keep your Super Duty planted with the KYB Gas-a-just Suspension Shock Absorber 555056, a high-pressure monotube gas shock for the rear axle of 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 fitment.
Unlike a traditional twin-tube design, this monotube separates the gas and oil to resist fade from aeration and respond instantly. It uses two working chambers: an air-free hydraulic piston and valve area for responsiveness and control, and a high-pressure nitrogen gas area with a floating piston that supports a comfortable ride during normal driving.
- High-pressure monotube: separates gas and oil for fade-free operation and instant response.
- Triple chrome plated chrome piston rod: an ultra-smooth rod that helps reduce seal wear, since fluid leaking can be a cause of shock failure.
- Built for work: components and valving designed specifically for Super Duty Ford trucks, adding damping over the OE design for vehicles that work, tow, and run larger, heavier tires and wheels.
- Damping upgrade: adds up to 25% more damping performance over original equipment shocks and helps keep Electronic Safety Systems performing as designed.
Sold individually; replacing both rear shocks together is recommended for balanced ride control.
Interchange: 5C3Z18125A · 6C3Z18125KBA · 77952 · 911267
This part cross-references / interchanges with the following part numbers:
Frequently Asked Questions
What is a monotube gas shock?
It houses the piston, valve, and a high-pressure nitrogen gas chamber with a floating piston in a single tube, separating gas and oil for fade-free operation and instant response.
Will this fit my truck?
It is a direct-fit rear shock for the 2005-2016 Ford F-250 Super Duty, 2008-2016 F-350 Super Duty, and 2011-2016 F-450 Super Duty. Check the Buyer's Guide tab to confirm your engine.
Does this replace a front or rear shock?
This is a rear shock absorber for the listed Super Duty applications.
How does the triple chrome plated rod help?
Fluid leaking can be a cause of shock failure, so the ultra-smooth triple chrome plated chrome piston rod is designed to reduce seal wear.
Should I replace shocks in pairs?
They are sold individually, but replacing both rear shocks together is recommended for balanced, even ride control.
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