National 710865 Drive Axle Shaft Seal - Front Inner

Drive Axle Shaft Seal for Ford Super Duty

The National 710865 drive axle shaft seal is built for front inner axle sealing on select Ford heavy-duty trucks and SUV applications. It uses a polyacrylate sealing material and a bi-directional lip design to help maintain a secure seal at the axle shaft interface.

Compatible With 2005-2018 Ford F-250 Super Duty, front inner; 2005-2018 Ford F-350 Super Duty, front inner; and 2005 Ford Excursion, front inner. This National 710865 seal is sized for a 1.575 in. shaft diameter, 2.626 in. outside diameter, and 0.748 in. width.

Key Features

• Drive axle shaft seal for front inner axle locations
• Polyacrylate material for sealing performance in driveline service
• Bi-directional lip design
• 1.575 in. inside diameter / shaft size
• 2.626 in. outside diameter and 0.748 in. width
• Housing bore: 2.618 in.
• Overall width with side lip: 0.827 in.
• National Series 710800 seal family

Product Details

National 710865 is an oil seal for driveline and axle sealing applications. It is engineered around the listed shaft and housing dimensions for direct replacement use on the specified Ford F-250 Super Duty, Ford F-350 Super Duty, and Ford Excursion front inner positions. National has focused on sealing solutions for decades, and this part reflects that experience with a design intended for modern vehicle service requirements. This part cross-references Spicer 2019816 for the same application.

What It Helps Address

• Axle oil seepage at the front inner shaft seal
• Contamination entering the axle housing through a worn seal
• Fluid loss around the axle shaft interface
• Noise or wear concerns tied to inadequate axle sealing
• Service replacement for deteriorated driveline sealing components

Installation Notes and Tips

Verify shaft diameter, housing bore, and seal width before installation. Confirm the vehicle uses the listed front inner configuration with a 9.75 in. ring gear, Spicer 60-SF axle, and Monobeam axle where noted in the fitment data. Inspect the sealing surface for scoring or corrosion before installing the new seal, and make sure the seal is seated squarely in the housing.

Quality Assurance

National is a long-established sealing brand with more than 75 years of experience in sealing technology. The 710865 is part of that sealing-focused product line and is built to meet the dimensional and application requirements listed for the covered Ford vehicles.