National 710677 Automatic Transmission Extension Housing Seal - Rear or Right

Automatic Transmission Seal Overview

National 710677 is an automatic transmission extension housing seal built for a wide range of import and domestic applications. It uses an ethylene-acrylic sealing material and a bi-directional lip design to support consistent sealing performance in transmission and transfer case service.

Compatible With BMW, Honda, Hyundai, Kia, Land Rover, and other applications listed below, this seal is specified by transmission type and vehicle configuration. The 710677 part number is also referenced across multiple aftermarket catalogs for the same application.

Key Features

• Ethylene-acrylic construction for transmission sealing applications.
• Bi-directional lip design for sealing in rotating service.
• Metric dimensions for accurate housing and shaft matching.
• National 710677 series seal for broad application coverage.
• Cross-references to select aftermarket part numbers for the same use case.

Application Details

This automatic transmission extension housing seal is used where the transmission output or extension housing requires a precise oil seal to retain fluid and control leakage. Fitment includes 2010-2012 Hyundai Genesis Coupe, 2011 Hyundai Equus, 2009-2011 Hyundai Genesis, 2009-2011 Kia Borrego, 2005-2009 Kia Sorento, and many BMW, Honda Accord, Honda CR-V, Honda Prelude, Land Rover Discovery, and other listed vehicles with the specified transmission codes.

The 710677 seal measures 40.000 mm inside diameter, 58.200 mm outside diameter, and 9.000 mm width. Those dimensions, along with the 58.000 mm housing bore specification, help confirm proper sealing interface during service on BMW 325Ci, Honda Accord, and Land Rover Discovery applications.

What It Helps Address

• Transmission fluid seepage at the extension housing.
• Oil leakage around the shaft sealing surface.
• Seal wear from age, heat, and fluid exposure.
• Improper sealing after transmission service or rebuild.
• Fitment issues when the original seal no longer holds specification.

Installation Notes

Verify the transmission code, housing bore, shaft diameter, and seal dimensions before installation. This part is listed for multiple transmission families, including ZF, Aisin, Jatco, and Magna Steyr applications, so matching the exact drivetrain configuration is essential. Clean the bore and sealing surface thoroughly before installing the new seal.

Quality Assurance

National has supplied sealing solutions for more than 75 years and continues to develop products for modern vehicle service needs. The 710677 part number is supported by broad catalog coverage and interchange references for the same application.