Firm up a hard-working Super Duty and keep it composed under load with the KYB Gas-a-just Suspension Shock Absorber 554347, a front high-pressure monotube gas shock. It installs as a direct-fit replacement for the 2005-2024 Ford F-250 Super Duty, 2005-2025 Ford F-350 Super Duty, 2005-2016 Ford F-450 Super Duty, and 2005-2022 Ford F-550 Super Duty — see the Buyer's Guide tab for engine-level fitment.
- High-pressure monotube design: separates the gas and oil for fade-free operation and instant response, with an air-free hydraulic piston/valve area for control and a high-pressure nitrogen chamber with a floating piston.
- Built for trucks that work: Gas-a-just monotubes add damping over the OE design for vehicles that tow and run larger, heavier tires and wheels — with components and valving designed specifically for Super Duty Ford trucks.
- Triple chrome-plated piston rod: an ultra-smooth finish helps reduce seal wear, since fluid leaking can be a cause of shock failure.
- Up to 25% more damping performance over original equipment shocks, and higher gas pressure that responds quickly to help improve steering response.
KYB notes the Gas-a-just also helps keep electronic safety systems performing as designed, since those systems depend on the suspension, brakes, and tires operating as the vehicle manufacturer intended.
Frequently Asked Questions
What is the KYB 554347?
It's a front high-pressure monotube gas shock absorber (KYB Gas-a-just, MPN 554347) for Ford Super Duty trucks, with separate gas and oil chambers for fade-free damping.
Which vehicles does it fit?
It's a direct-fit front shock for the 2005-2024 Ford F-250, 2005-2025 F-350, 2005-2016 F-450, and 2005-2022 F-550 Super Duty. Check the Buyer's Guide tab for engine-level fitment.
How is a monotube different from a twin-tube shock?
The monotube design separates the gas and oil, which helps prevent aeration-related fade and supports instant response and control under load.
Is this a good choice for towing or heavier tires?
Yes. Gas-a-just monotubes add damping over the OE design for trucks that work, tow, and run larger, heavier tires and wheels, with valving designed for Super Duty trucks.
Should I replace shocks in pairs?
This listing is for one shock. Replacing both sides on an axle together is recommended for balanced, even ride control. Confirm the quantity your vehicle needs.
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