Firm up a loaded rear end and keep body motion in check with the KYB Gas-a-just Suspension Shock Absorber 554362, a high-pressure monotube gas shock that installs as a direct-fit rear replacement for the 2005-2016 Ford F-450 Super Duty and 2005-2016 Ford F-550 Super Duty. See the Buyer's Guide tab to confirm your exact configuration.
- High-pressure monotube design: separates the gas and oil into distinct chambers for fade-free operation and instant response, resisting the aeration that affects traditional twin-tube shocks.
- Two 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.
- Triple-chrome-plated piston rod: an ultra-smooth rod that helps reduce seal wear, since fluid leaking can be a cause of shock failure.
- Heavy-duty valving: components and valving designed specifically for heavy-duty trucks, adding damping over the OE design for vehicles that work, tow, and run larger, heavier tires and wheels — up to 25% more damping performance over original equipment shocks.
The higher gas pressure responds quickly to improve steering response and helps keep electronic safety systems performing as designed. Signs a rear shock may need replacing include excessive bounce, nose dive, body sway, or fluid seepage down the shock body.
Interchange: 5C3Z18125DA · BC3Z18125G · 77623 · 65174
This part cross-references / interchanges with the following part numbers:
Frequently Asked Questions
What is the KYB 554362?
It's a KYB Gas-a-just high-pressure monotube gas shock absorber, a rear direct-fit replacement for the listed Ford F-450 and F-550 Super Duty trucks.
Which vehicles does it fit?
It fits the rear of the 2005-2016 Ford F-450 Super Duty and 2005-2016 Ford F-550 Super Duty. Check the Buyer's Guide tab to confirm your configuration.
How is a monotube shock different from a twin-tube?
The high-pressure monotube separates the gas and oil into distinct chambers for fade-free operation and instant response, resisting the aeration that can affect twin-tube designs.
What does the triple-chrome-plated piston rod do?
The ultra-smooth rod helps reduce seal wear. Since fluid leaking can be a cause of shock failure, that smoother surface supports longer seal life.
How many should I order?
Shocks are sold individually. Replacing both rear shocks together as a matched pair is recommended for balanced, even ride control.
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