KYB 3440123 Suspension Shock Absorber - Rear

KYB Excel-G Rear Shock for Avalon

KYB Excel-G shock absorber 3440123 is built to restore original ride control on the rear of select Toyota Avalon models. It uses a nitrogen gas-charged, twin-tube design and OE-quality components to return factory-style stability, stopping response, and handling balance.

The Excel-G line is KYB’s OEA replacement range, produced on the same KYB OE assembly lines used for new vehicle supply. For Toyota Avalon rear suspension service, 3440123 is a direct-fit replacement focused on restoring the vehicle’s designed performance rather than changing ride characteristics.

Key Features

• Part number 3440123
• KYB Excel-G OEA replacement line
• Nitrogen gas-charged, twin-tube construction
• OE-quality components built on KYB OE assembly lines
• Internal rebound spring included
• Lower mount type: E2 (16.1x50)
• Upper mount type: S1 (12MM)
• Compressed length: 13.93 in; extended length: 17.61 in; stroke length: 3.98 in

Detailed Description

KYB 3440123 is engineered for rear suspension service on the Toyota Avalon, with fitment for 2019-2021 Toyota Avalon, Rear, and 2022 Toyota Avalon, Rear. This Excel-G shock absorber is calibrated to restore original ride control, lane-change responsiveness, and chassis stability while maintaining the vehicle’s factory-tuned feel. If you are replacing a worn rear shock on a Toyota Avalon, 3440123 provides an OE-style solution that matches the original application requirements.

This part cross-references Monroe Shocks & Struts (e.g., 485308Z066) for the same application.

What It Helps Address

• Excessive rear bounce after bumps
• Reduced stability during braking and cornering
• Loose or unsettled rear suspension feel
• Uneven handling response in lane changes
• Wear-related loss of factory ride control

Installation Notes and Tips

Verify rear fitment by model year before installation. Confirm the upper and lower mount types match the vehicle’s original hardware and inspect surrounding suspension components for wear, including mounts and bushings, before replacing the shock absorber. For Toyota Avalon rear shock replacement, 3440123 should be installed as a direct OE-style service part following standard suspension procedures.

Quality Assurance

KYB is a major OE shock and strut supplier, and the Excel-G line is manufactured on KYB OE assembly lines using OE-quality components. The product is classified as OEA, indicating an aftermarket replacement built to restore original equipment performance characteristics for the Toyota Avalon.