Keep the rear of your truck controlled and composed with the KYB Gas-a-just Suspension Shock Absorber 554373, a high-pressure monotube gas shock that installs as a direct-fit rear replacement for the 2009-2025 Ford F-150 (see the Buyer's Guide tab for engine-level fitment). Its components and valving are designed specifically for Ford F-150s, making it a purpose-built option for trucks that work, tow, or run larger, heavier tires and wheels.
- High-pressure monotube design: separates the gas and oil for fade-free operation and instant response, with two working chambers — an air-free hydraulic piston/valve area for control and a high-pressure nitrogen gas area with a floating piston.
- Up to 25% more damping: adds additional damping over the OE design compared with original-equipment shocks.
- Triple chrome-plated piston rod: an ultra-smooth rod helps reduce seal wear, since fluid leaking can be a cause of shock failure.
- Quick response: the higher gas pressure responds quickly to help improve steering response and helps keep Electronic Safety Systems performing as designed.
Worn shocks may show up as excessive bounce, nose dive, or poor ride control — if a failed rear shock is the cause, this replaces it. Sold individually; replacing both sides together is recommended for balanced control.
Interchange: 9L3Z18125E · 9L3Z18125F · AL3Z18125C · AL3Z18125H · AL3Z18125L · G63867 · 911302
This part cross-references / interchanges with the following part numbers:
Frequently Asked Questions
What vehicles does this shock fit?
It is a direct-fit rear replacement for the 2009-2025 Ford F-150. Check the Buyer's Guide tab to confirm engine-level fitment for your specific truck.
Is this a front or rear shock?
This is a rear position shock absorber. It is sold individually, so replacing both rear sides together is recommended for balanced ride control.
What is a high-pressure monotube design?
It separates the gas and oil into distinct chambers for fade-free operation and instant response, using an air-free hydraulic area plus a high-pressure nitrogen gas area with a floating piston.
How does it compare to OE shocks?
KYB states the Gas-a-just adds up to 25% more damping performance over original-equipment shocks, with valving designed specifically for Ford F-150s that work, tow, or run larger tires and wheels.
How do I know if my shocks need replacing?
Signs may include excessive bouncing, nose dive under braking, or poor ride control. Diagnose the cause first; if a failed rear shock is confirmed, this part replaces it.
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