National 710971 Transfer Case Input Shaft Seal

Transfer Case Input Shaft Seal Overview

National 710971 is a transfer case input shaft seal built for PTU transfer case applications. It uses a fluoro-elastomer sealing material and a bi-directional lip design to help maintain a tight seal under operating conditions.

Key Features

• Fluoro-elastomer construction for sealing performance in demanding driveline service.
• Bi-directional lip design for consistent sealing action.
• Dimensions include a 1.811-inch shaft size, 2.780-inch outside diameter, and 0.455-inch width.
• Part of National Series 710900 oil seal engineering.
• Transfer case gasket and sealing system component for service replacement.

Detailed Description

This National transfer case input shaft seal is engineered for PTU transfer case service and is identified by part number 710971. The seal’s fluoro-elastomer material is selected for sealing durability, while the bi-directional lip design supports reliable contact around the shaft. With a 46.000 mm shaft size and 70.600 mm outside diameter, it is built to match the specified application dimensions for a proper service replacement. This part cross-references Bosch 18126 for the same application. National 710971 is listed for 2017 Ford Explorer, 2001-2012 Ford Escape, 2005-2011 Mercury Mariner, and 2001-2006 or 2008-2009 Mazda Tribute with Power Transfer Unit (PTU) transfer case.

What It Is Used For

• Replacing a worn transfer case input shaft seal.
• Addressing fluid seepage at the input shaft area.
• Restoring sealing performance in PTU transfer case service.
• Correcting leaks caused by hardened or damaged seal material.
• Supporting driveline maintenance on specified Ford, Mercury, and Mazda applications.

Installation Notes and Tips

Verify the transfer case configuration and match the shaft and housing dimensions before installation. Clean the sealing surface thoroughly and inspect the shaft for wear, scoring, or contamination that could affect seal life. Confirm the application by vehicle, model year, and PTU transfer case notes before ordering. Fits 2017 Ford Explorer, N/A; Fits 2001-2012 Ford Escape, N/A; Fits 2005-2011 Mercury Mariner, N/A; Fits 2008-2009 Mazda Tribute, N/A; Fits 2001-2006 Mazda Tribute, N/A.

Quality Assurance

National has more than 75 years of sealing experience and continues to develop sealing solutions for modern vehicles. Part number 710971 reflects that engineering focus in a service seal for specified transfer case applications.