KYB 551127 Suspension Strut - Front Left

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

KYB Gas-a-Just 551127 is a monotube suspension strut built as an OE-style replacement for the front left position. It is engineered to restore original handling response on Lexus IS250 and Lexus IS350 applications while adding the firmer control expected from a high-pressure monotube design.

Key Features

• OE monotube replacement for the correct front left suspension position
• Fits 2006-2013 Lexus IS250, front left
• Fits 2011-2013 Lexus IS350, front left
• High-pressure monotube construction separates gas and oil for consistent response
• Air-free hydraulic piston and valve area improves control and steering feel
• Floating piston and nitrogen gas chamber support a comfortable ride in normal driving
• Triple chrome plated piston rod helps reduce seal wear from fluid leakage
• Built for vehicles that tow, work, or use larger, heavier tires and wheels
• Part number 551127

Product Details

The KYB Gas-a-Just line is designed for drivers who want OE-type fit and a more responsive suspension feel. This strut uses a monotube layout with separate working chambers, allowing the hydraulic side to react quickly while the gas chamber adds pressure for immediate damping response when road conditions change. On Lexus IS250 and Lexus IS350 models, that means more controlled steering response, better body control, and stable performance under demanding use. Part number 551127 is a direct-fit front left strut for the listed applications.

This part cross-references Monroe Shocks & Struts (e.g., 39132, 39139) for the same application.

What It Helps Address

• Excessive bounce or poor damping control
• Loose steering response or delayed front-end reaction
• Ride fade during repeated suspension movement
• Oil seal wear related to fluid leakage
• Reduced stability on vehicles with heavier wheels or more demanding use

Installation Notes

Install on the front left position only for the listed Lexus IS fitments. Replace the suspension strut and coil spring assembly according to the vehicle manufacturer’s instructions. Verify upper mount thread size and suspension configuration before installation. After replacement, inspect alignment settings and confirm proper suspension operation.

Quality Assurance

KYB designs the Gas-a-Just line as an OE monotube replacement to help restore the vehicle’s original handling characteristics. The monotube design, high gas pressure, and chrome-plated piston rod are used to support consistent damping performance and long-term seal protection.