KYB 344308 Shock Absorber - Rear

KYB Excel-G Rear Shock for Toyota Sienna

The KYB Excel-G 344308 is a rear suspension shock absorber for select Toyota Sienna models. Built to restore original ride control, it focuses on stability, braking response, lane-change handling, and consistent tire contact rather than changing the vehicle’s factory tuning.

Compatible with 2004-2020 Toyota Sienna rear applications listed below, this KYB Excel-G shock is a direct-fit OE-style replacement for drivers and technicians looking to return the suspension to designed performance.

Key Features

• OE-style replacement for Asian mini-vans, including Toyota Sienna rear applications
• Nitrogen gas-charged twin-tube design for controlled damping
• Triple-lip fluid seal helps reduce oil and gas leakage
• Vehicle-specific, hand-assembled damping valves manage tire contact, steering response, and body movement
• Strong strut body and bracket construction helps minimize flex and maintain alignment
• Made in the USA
• R-stop design included
• Compressed length: 16.41 in; extended length: 26.18 in; stroke length: 9.77 in
• Lower mount type: E2(22X40); upper mount type: S1(12MM)

Product Details

KYB Excel-G is the brand’s OE replacement line, built on the same assembly lines and with the same quality components used for original equipment production. The 344308 is calibrated to restore factory ride characteristics on the Toyota Sienna, helping the suspension work as the vehicle manufacturer intended. This part cross-references Monroe Shocks & Struts (e.g., 37284) for the same application.

What It Helps Address

• Excessive rear bounce or float
• Reduced stability during braking or lane changes
• Uneven tire contact caused by worn damping
• Loose or unsettled rear suspension feel
• Loss of factory ride control on a Toyota Sienna

Installation Notes

• Fits 2014-2020 Toyota Sienna, rear, recommended OEM replacement; w/o Mobility Auto Access; additional components, dust cover, or bushings may be required.
• Fits 2011-2013 Toyota Sienna, rear, recommended OEM replacement; w/o Mobility Auto Access Package; additional components, dust cover, or bushings may be required.
• Fits 2005-2010 Toyota Sienna, rear, recommended OEM replacement; w/ 7 Passenger Seating; additional components, dust cover, or bushings may be required.
• Fits 2004 Toyota Sienna, rear, recommended OEM replacement; additional components may be required.
• Verify mount style and dimensions before installation to confirm the correct rear shock absorber for your vehicle.

Quality Assurance

KYB supplies shocks and struts to new vehicle manufacturers, and Excel-G is produced to OE-quality standards for original-style ride restoration. Part number 344308 is engineered for the rear suspension on select Toyota Sienna models and is built to support factory-level control and handling characteristics.