KYB SR4120 Suspension Strut and Coil Spring Assembly - Front Left

KYB Strut-Plus Front Left Assembly

The KYB Strut-Plus SR4120 is a front left suspension strut and coil spring assembly for select Toyota trucks and SUVs. It is built to restore ride height, steering response, and vehicle control with an exact-fit, pre-assembled design.

Compatible with 2003-2009 Toyota 4Runner, front left, and 2007-2009 Toyota FJ Cruiser, front left, this assembly is engineered for OE-style replacement on vehicles with the listed applications.

Key Features

• OE-style replacement choice for Asian vehicles
• Includes a KYB Excel-G strut, stronger steel outer shell, and application-specific damping valves
• High-carbon steel coil spring is matched to vehicle attributes and corner weights to help restore OE ride height
• Assembled in the USA
• Exact fitment, pre-assembled for professional results
• Side-specific design with left and right part numbers as the vehicle manufacturer intended
• Engineered to help vehicles with electronic safety systems such as ESC and ABS
• Recipient of a 2018 industry award in the import aftermarket category

Product Details

KYB Strut-Plus SR4120 combines a replacement strut and coil spring into one front left assembly for the 2003-2009 Toyota 4Runner and 2007-2009 Toyota FJ Cruiser. The KYB Strut-Plus line is built around KYB’s OE-restoring strut design, then paired with a high-carbon steel spring selected to help return the vehicle to factory ride height and handling balance. This part cross-references Monroe Shocks & Struts (e.g., 182220) for the same application.

What This Part Helps Address

• Front-end sag or reduced ride height
• Loose, unstable, or inconsistent handling
• Worn strut performance that affects steering feel
• Noise or harshness from a fatigued suspension assembly
• Ride quality changes after strut and spring wear

Installation Notes

Install on the front left position only. Verify vehicle configuration before ordering; this application excludes X-REAS and adjustable suspensions on the 4Runner. Follow manufacturer service procedures and alignment requirements after installation. Part number SR4120 is pre-assembled for a direct replacement workflow, and SR4120 is also referenced for the 2007-2009 Toyota FJ Cruiser front left application.

Quality Assurance

KYB is an original equipment supplier, and the Strut-Plus line is engineered to restore handling and control characteristics using OE-focused components and application-specific damping. The assembly is built to support vehicles equipped with electronic safety systems such as ESC and ABS when used in the listed applications.