KYB Gas-a-just Front Left Monotube Strut for Lexus GS300 and GS350

The Gas-a-just monotube strut is available as an OE monotube replacement to restore your vehicle's original capabilities. The KYB Gas-a-just has two separate working chambers: An air-free hydraulic piston and valve area for responsiveness and control, and a second high-pressure nitrogen gas area with a floating piston that provides a comfortable ride during normal driving and adds instant performance on demand.

• To reduce the chance of noise and vibration KYB recommends installing new strut mounts, part number: SM5738

The KYB Gas-a-just front left monotube strut is designed as an OE-style replacement for restoring the original handling, control, and ride characteristics of compatible Lexus GS models. Its monotube design provides responsive damping and consistent performance for drivers seeking dependable suspension operation during everyday driving and changing road conditions.

The strut uses two separate working chambers. An air-free hydraulic piston and valve area helps deliver precise response and control, while a high-pressure nitrogen gas chamber with a floating piston helps maintain ride comfort during normal driving and provides immediate damping performance when additional control is needed. This design helps reduce fade and supports stable vehicle behavior during acceleration, cornering, and braking.

• Performance: Monotube construction provides responsive damping and consistent suspension control.
• Ride Quality: High-pressure nitrogen gas and a floating piston support a comfortable ride during normal driving.
• Handling: Separate hydraulic and gas chambers help deliver quick response when additional performance is required.
• Installation Support: KYB recommends installing a new strut mount, part number SM5738, to help reduce the chance of noise and vibration.

Product specifications and technical data:

• Brand: KYB
• Part Number: 551129
• Product Type: Front left monotube strut
• Application: Automotive suspension replacement
• Strut Design: Gas-a-just monotube
• Gas Technology: High-pressure nitrogen with floating piston
• Position: Front left
• Recommended Accessory: KYB strut mount SM5738

What's included: One KYB Gas-a-just front left monotube strut. Strut mounting hardware and replacement strut mount are not included unless otherwise specified.

Fitment: Fits 2006 Lexus GS300 and 2007–2011 Lexus GS350 applications when equipped with non-adaptive control suspension. Verify vehicle configuration and suspension type before ordering.

Features:

• Monotube construction provides responsive damping and consistent suspension control.
• High-pressure nitrogen gas chamber with floating piston supports ride comfort and performance.
• Air-free hydraulic piston and valve area improves handling response and control.
• KYB recommends new strut mount SM5738 to help reduce noise and vibration.

Fitments:
2006 Lexus GS300 Base
2007 Lexus GS350 Base
2008 Lexus GS350 Base
2009 Lexus GS350 Base
2010 Lexus GS350 Base
2011 Lexus GS350 Base

Air Freight Prohibited: false
Not Carb Approved: false
Ltl Freight Required: false
Prop 65: Unknown
Part Type: automotive
Epa: N/A
Clearance Item: t
Carb Acknowledgement Required: false
Regular Stock: false
Units Per Sku: 1