KYB 551129 Suspension Strut - Front Left

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

The KYB Gas-a-just 551129 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 of the Lexus GS while delivering quicker response under load, towing, or with larger wheels and tires.

Key Features

• Monotube OEM replacement for the front left suspension position
• Restores designed steering response and ride control on Lexus GS applications
• High-pressure gas and oil separation for consistent, fade-resistant operation
• Built for vehicles that work, tow, or carry heavier tire and wheel setups
• Triple chrome plated piston rod helps reduce seal wear from fluid leakage
• Internal rebound spring included; dust cover not included
• Upper mount thread size: 12x1.25

Product Details

KYB Gas-a-just struts use a two-chamber monotube design with an air-free hydraulic working area and a separate high-pressure nitrogen gas chamber. That layout gives the strut fast response during normal driving and added performance when suspension demand increases. For Lexus GS owners looking for a front left strut replacement, KYB 551129 is a direct-fit option for restoring factory-like suspension behavior on the specified GS350 and GS300 applications.

This part cross-references Lexus OE numbers 4852080041 and 4852080084 for the same application. It is also a strong search match for buyers looking for a 2007-2011 Lexus GS350 front left strut or a 2006 Lexus GS300 front left suspension strut replacement.

What It Helps Address

• Excessive front-end bounce or reduced damping control
• Slow steering response or loose-feeling handling
• Ride fade during heavier use, towing, or spirited driving
• Suspension performance loss from worn OE strut components
• Noise and vibration concerns when paired with worn mounts

Installation Notes

Fits 2007-2011 Lexus GS350, front left, excluding Adaptive Control Suspension. Fits 2006 Lexus GS300, front left; replace the suspension strut and coil spring assembly according to the manufacturer’s instructions. KYB recommends new strut mounts, part number SM5738, to reduce the chance of noise and vibration. Verify thread size, mounting style, and vehicle suspension configuration before installation.

Quality Assurance

KYB is a major OE suspension supplier, and the Gas-a-just line is built to meet the demands of original-equipment replacement. The monotube design, high-pressure gas separation, and chrome piston rod construction are selected to support consistent damping performance and long service life in the specified Lexus GS applications.