Take control of your truck's ride with the KYB Gas-a-just Suspension Strut (MPN 551125), a high-pressure monotube gas strut that mounts in the front position. It's a direct-fit replacement for the 2007-2021 Toyota Tundra, with components and valving KYB designed specifically for Toyota Tundras.
- High-pressure monotube design: Separates the gas and oil for fade-free operation and instant response, and never experiences fade due to aeration.
- 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 helps reduce seal wear, since fluid leaking can be a cause of shock failure.
- Built for work and towing: Adds up to 25% more damping performance over original equipment shocks, with extra damping for vehicles that work, tow, and run larger, heavier tires and wheels.
The higher gas pressure responds quickly to help improve steering response, and helps keep Electronic Safety Systems performing as the manufacturer designed. Sold individually; replacing both front units as a matched pair is recommended for balanced handling.
Interchange: G51855 · 37298 · 4851009Q90 · 4851009R20 · 4851009R30
This part cross-references / interchanges with the following part numbers:
Frequently Asked Questions
What vehicles does the KYB 551125 strut fit?
It's a direct-fit front replacement for the 2007-2021 Toyota Tundra. Check the Buyer's Guide tab to confirm the exact fit for your vehicle.
Is this a monotube or twin-tube design?
It's a high-pressure monotube gas strut. The monotube design separates the gas and oil for fade-free operation and instant response, and avoids fade due to aeration.
What position does this strut install in?
This unit installs in the front position. It is sold individually, and replacing both front struts as a matched pair is recommended for balanced handling.
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 extra damping for trucks that work, tow, and run larger, heavier tires and wheels.
Why does it use a triple chrome-plated piston rod?
Fluid leaking can be a cause of shock failure, so the ultra-smooth triple chrome-plated piston rod is designed to help reduce seal wear.
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