Firm up front-end control and tame body motion with the KYB Gas-a-just Suspension Strut (MPN 551134), a high-pressure monotube gas unit that drops in as a front-position replacement for the 2009-2013 Ford F-150 — see the Buyer's Guide tab for engine-level fitment. This Gas-a-just monotube 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 that supports a comfortable ride during normal driving and adds damping on demand.
- Monotube gas design: Separates the gas and oil for fade-free operation and instant response, avoiding the aeration that affects traditional twin-tube designs.
- Triple chrome-plated piston rod: An ultra-smooth rod helps reduce seal wear, since fluid leaking can be a cause of shock failure.
- Higher gas pressure: Designed to respond quickly and improve steering response, and helps keep Electronic Safety Systems performing as intended.
- Truck-tuned valving: Components and valving designed specifically for Ford F-150s, adding up to 25% more damping over original-equipment shocks for vehicles that work, tow, and run larger, heavier tires and wheels.
Sold individually; for even, balanced handling, replacing both front struts as a matched pair is recommended.
Interchange: 9L3Z18124BE · AL3Z18124AA · AL3Z18124BA · G51865 · 71141
This part cross-references / interchanges with the following part numbers:
Frequently Asked Questions
What vehicle does this KYB 551134 strut fit?
It is a front-position direct-fit replacement for the 2009-2013 Ford F-150. Check the Buyer's Guide tab to confirm the exact engine and configuration for your truck.
How is a monotube gas strut different from a twin-tube design?
The Gas-a-just monotube separates the gas and oil into distinct chambers for fade-free operation and instant response, avoiding the aeration that can affect traditional twin-tube shocks.
Does it offer more damping than the factory shocks?
KYB states the Gas-a-just adds up to 25% more damping performance over original-equipment shocks, with components and valving designed specifically for the F-150.
What does the triple chrome-plated piston rod do?
Because fluid leaking can be a cause of shock failure, the ultra-smooth triple chrome-plated rod is designed to reduce seal wear for longer, more reliable operation.
Should I replace both front struts at once?
This strut is sold individually. Replacing both front struts together as a matched pair is recommended for even, balanced handling and ride.
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