KYB 551128 Suspension Strut - Front Right

KYB Gas-a-Just Front Right Strut for Lexus GS300/GS350

The KYB Gas-a-just 551128 is a monotube suspension strut built as an OE-style replacement for the front right corner. It restores the original control and handling expected from the Lexus GS300 and Lexus GS350 while adding quick response for heavier-duty driving conditions.

KYB’s Gas-a-just line uses a monotube design with separate gas and oil chambers. That layout supports consistent damping, fade-resistant operation, and fast reaction when steering input or road conditions change. Part number 551128 is a direct fit for select Lexus GS300 and GS350 applications.

Key Features

• Monotube OE replacement for the front right suspension position
• Fits 2007-2011 Lexus GS350, front right, excluding adaptive control suspension
• Fits 2006 Lexus GS300, front right
• High-pressure nitrogen gas chamber for quick response and stable control
• Separate gas and oil working chambers for fade-resistant damping
• Triple chrome plated piston rod helps reduce seal wear and fluid leakage
• Internal rebound spring included
• Designed for vehicles that tow, work, or use larger, heavier tires and wheels

Product Details

The KYB Gas-a-just 551128 is engineered to restore the designed suspension behavior of the Lexus GS300 and Lexus GS350. Its monotube construction provides an air-free hydraulic piston area for responsiveness and a high-pressure gas section with a floating piston for consistent ride control. This setup supports sharper steering response and dependable damping under load. If you are replacing a worn front right strut on a 2007-2011 Lexus GS350 or a 2006 Lexus GS300, part number 551128 is a direct OE-style solution. This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

Common Problems This Strut Can Address

• Excessive front-end bounce or poor road control
• Reduced steering response during lane changes or cornering
• Suspension fade after repeated bumps or heavier driving loads
• Oil leakage from a worn front right strut
• Uneven ride quality caused by a failing OE strut

Installation Notes and Tips

Compatible With 2007-2011 Lexus GS350, front right, and 2006 Lexus GS300, front right. KYB recommends replacing the strut mount with SM5738 to reduce noise and vibration. For the 2006 Lexus GS300 application, replace the suspension strut and coil spring assembly according to the manufacturer’s instructions. Verify upper mount thread size 12x1.25 and confirm the vehicle is not equipped with adaptive control suspension on GS350 models before installation.

Quality Assurance

KYB is a major OE suspension supplier, and the Gas-a-just line is built to restore factory-style control with monotube performance characteristics. Part number 551128 is engineered for consistent damping, improved steering response, and long-term seal protection through its chrome-plated piston rod design.