KYB 339139 Suspension Strut - Rear Left

KYB Excel-G Rear Left Strut for Avalon

KYB Excel-G part number 339139 is a suspension strut for the rear left position on the 2004 Toyota Avalon. It is built to restore original ride control, steering response, and body movement characteristics while maintaining the vehicle’s designed handling balance.

The Excel-G line is KYB’s OE-style replacement range, assembled on KYB production lines with OE-quality components and calibrated to return the suspension to factory performance targets. For a 2004 Toyota Avalon rear left strut replacement, 339139 provides a direct-fit solution focused on control and stability.

Key Features

• Fits 2004 Toyota Avalon, rear left
• KYB Excel-G OE-style replacement line
• Nitrogen gas-charged twin-tube suspension strut
• Triple-lip fluid seal helps reduce oil and gas leakage
• Vehicle-specific damping valves manage tire contact, steering response, and body movement
• Strong strut body and bracket design helps minimize flex and maintain alignment
• Part number 339139

Detailed Description

KYB 339139 is engineered for drivers replacing the rear left strut on a 2004 Toyota Avalon and wanting the suspension to perform as originally designed. The Excel-G platform is calibrated to restore ride control rather than alter it, making it a practical choice for maintaining factory-like handling, braking stability, and lane-change response. This part number 339139 uses a twin-tube, gas-charged design with OE-quality construction details that support consistent damping performance.

This part cross-references Monroe Shocks & Struts 72455 and Gabriel G55675 for the same application.

What It Helps Address

• Excessive rear suspension bounce or float
• Reduced stability during braking and lane changes
• Uneven tire contact caused by worn damping
• Noisy or loose-feeling rear suspension response
• Loss of original handling balance on a Toyota Avalon

Installation Notes and Tips

Fits 2004 Toyota Avalon, rear left. Replace the suspension strut and coil spring assembly according to the manufacturer’s instructions. KYB recommends installing new strut mounts, part number SM5175, to reduce noise and vibration. A KYB strut boot, part number SB101, helps protect the strut from dirt, debris, and road salt.

Quality Assurance

KYB is a major OE supplier of shocks and struts, and the Excel-G line is produced on the same KYB OE assembly lines using OE-quality components. The design is classified as OEA, reflecting its focus on restoring original equipment performance for the 2004 Toyota Avalon rear left suspension position.