KYB 551107 Suspension Strut - Front Left

KYB Gas-a-Just Front Left Strut for Lexus GS

The KYB Gas-a-Just 551107 is a monotube suspension strut built as an OE-style replacement for the front left position. It is engineered to restore the original control and handling expected from the Lexus GS, with quick response for vehicles that carry extra load, tow, or run larger wheels and tires.

Key Features

• Monotube OEM replacement designed for the correct front suspension application
• Restores steering response and handling on Lexus GS models
• High-pressure gas and oil separation supports fade-resistant operation and immediate damping response
• Built for vehicles that work, tow, or use heavier tire and wheel setups
• Triple chrome plated piston rod helps reduce seal wear from fluid leakage
• Internal rebound spring and precision valving support consistent suspension control
• Compatible with electronic safety systems that rely on factory suspension performance

Product Details

KYB Gas-a-Just part number 551107 uses a monotube design with two working chambers: an air-free hydraulic section for control and a high-pressure nitrogen gas section with a floating piston for added response. This design helps maintain stable damping during normal driving while delivering firmer control when the suspension is working harder. For Lexus GS applications, 551107 is a direct front left strut choice for drivers who want to restore factory-like behavior without changing the vehicle’s suspension layout.

This part cross-references Lexus 4852080084 and 4852080178 for the same application.

What It Helps Address

• Excessive front-end bounce or oscillation
• Reduced steering response during lane changes or braking
• Uneven ride control after strut wear
• Loss of damping performance under heavier loads
• Noise or instability caused by worn suspension struts

Installation Notes

Fits 2007-2011 Lexus GS350, front left, recommended OEM replacement; Gas-a-just. Fits 2006 Lexus GS300, front left; replace the suspension strut and coil spring assembly according to the manufacturer’s instructions; Gas-a-just. Verify compressed length, extended length, stroke, and mount specifications before installation. The upper mount type is 12x1.25 and the lower mount type is E2 (14.2x42). Dust cover is not included.

Quality Assurance

KYB designs the Gas-a-Just line as an OE monotube replacement to help restore factory suspension behavior on Lexus GS applications. The monotube construction, high-pressure gas charge, and chrome piston rod are selected to support consistent damping and reduced seal wear in daily driving conditions.