Smooth out the ride and tame body motion with the KYB Gas-a-just Shock Absorber (P/N 554388), a high-pressure monotube gas KYB shock absorber built for the REAR of the 2008-2016 Ford F-250 Super Duty, 2008-2016 Ford F-350 Super Duty, and 2011-2016 Ford F-450 Super Duty. Its components and valving are designed specifically for Super Duty Ford trucks — see the Buyer's Guide tab for the full engine-level fitment.
The Gas-a-just uses two separate working chambers: an air-free hydraulic piston and valve area for responsiveness and control, plus a high-pressure nitrogen gas area with a floating piston for a comfortable ride during normal driving and instant performance on demand.
- Monotube design: separates the gas and oil for fade-free operation and instant response, with no fade from aeration.
- Extra damping: adds up to 25% more damping performance over original equipment shocks — intended for trucks that work, tow, and run larger, heavier tires and wheels.
- Triple chrome plated piston rod: ultra-smooth rod helps reduce seal wear, since fluid leaking can be a cause of shock failure.
- Safety systems: helps keep Electronic Safety Systems performing as the vehicle manufacturer intended.
Sold individually; replacing both rear shocks together as a matched pair is recommended for balanced damping.
Interchange: 7C3Z18125CEA · BC3Z18125A · BC3Z18125B · G64010 · 911265
This part cross-references / interchanges with the following part numbers:
Frequently Asked Questions
What vehicles does the KYB 554388 shock absorber fit?
It is designed for the rear of the 2008-2016 Ford F-250 Super Duty, 2008-2016 Ford F-350 Super Duty, and 2011-2016 Ford F-450 Super Duty. Check the Buyer's Guide tab to confirm your vehicle.
Is this a gas shock absorber?
Yes. The KYB Gas-a-just is a high-pressure monotube gas shock absorber that separates the gas and oil for fade-free operation and instant response.
How much does this KYB shock absorber add over the original equipment?
KYB rates the Gas-a-just at up to 25% more damping performance over original equipment shocks, with extra damping intended for trucks that work, tow, and run larger, heavier tires and wheels.
How many should I buy?
This listing is for one shock, sold individually. Replacing both rear shocks together as a matched pair is recommended for even, balanced damping.
What does the triple chrome plated piston rod do?
Since fluid leaking can be a cause of shock failure, the ultra-smooth triple chrome plated piston rod is designed to reduce seal wear.
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