Firm up the ride and keep your load-hauling rear suspension in control with the KYB Gas-a-just Suspension Shock Absorber 554388, a high-pressure monotube gas shock. It's a direct-fit rear replacement for the 2008-2016 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 details.
- High-pressure monotube design: separates the gas and oil for fade-free operation and instant response, avoiding the aeration that can affect a traditional twin-tube shock.
- Up to 25% more damping: adds up to 25% more damping performance over original equipment shocks, with components and valving designed specifically for Super Duty Ford trucks that work, tow, and run larger, heavier tires and wheels.
- Triple chrome-plated piston rod: an ultra-smooth, triple chrome-plated rod helps reduce seal wear, since leaking fluid can be a cause of shock failure.
- Steering and safety: the higher gas pressure responds quickly to help improve steering response, and KYB designs the Gas-a-just to help keep Electronic Safety Systems performing as intended.
Signs a rear shock may need replacing include excessive bouncing, bottoming out over bumps, or fluid leaking from the shock body. Sold individually; replace both rear shocks together as a matched pair 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 fit?
It's a rear-position direct fit for 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 monotube or twin-tube shock?
It's a high-pressure monotube gas shock. The design separates the gas and oil for fade-free operation and instant response, avoiding the aeration that can affect twin-tube shocks.
How much more damping does it provide?
KYB states the Gas-a-just adds up to 25% more damping performance over original equipment shocks, with valving designed specifically for Super Duty Ford trucks.
Do I need to replace both rear shocks?
Each shock is sold individually. Replacing both rear shocks together as a matched pair is recommended for balanced, even damping across the axle.
What are signs my shock needs replacing?
Common signs include excessive bouncing, bottoming out over bumps, poor ride control, or fluid leaking from the shock body. Diagnose the cause before replacing.
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