National 710925 Drive Axle Shaft Seal - Front Outer

Drive Axle Shaft Seal for Ford Super Duty

National 710925 is a drive axle shaft seal built for front outer axle service on select Ford trucks and SUVs. It uses a polyacrylate sealing material and precise dimensional sizing to support a secure seal at the axle housing and shaft interface.

Compatible With 2005-2018 Ford F-250 Super Duty front outer applications, 2005-2016 Ford F-350 Super Duty front outer applications, and 2005 Ford Excursion front outer applications with the listed axle configurations.

Key Features

• Polyacrylate construction for sealing performance in driveline service
• Oil seal design for front outer drive axle shaft applications
• Housing bore: 5.465 in. / 138.811 mm
• Outside diameter: 5.479 in. / 139.167 mm
• Overall width with side lip: 1.213 in. / 30.810 mm
• Shaft size: 3.545 in. / 90.043 mm
• Flanged outside diameter: 0.997 in.
• National 710925 / Series 710900

Detailed Description

National 710925 is an oil seal for driveline and axle sealing systems, engineered for front outer axle positions on Ford Super Duty and Excursion applications. The seal dimensions are specified for a controlled fit in the housing bore and around the shaft, helping maintain a proper barrier at the axle shaft opening. National has focused on sealing products for more than 75 years, and this part reflects that experience with a design suited to modern vehicle service requirements. This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

Common Repair Uses

• Replacing a leaking front outer axle shaft seal
• Addressing gear oil seepage at the axle housing
• Restoring sealing at the shaft-to-housing interface
• Repairing contamination caused by a worn or hardened seal
• Correcting fluid loss in front axle service on Ford F-250 Super Duty, Ford F-350 Super Duty, and Ford Excursion models

Installation Notes and Tips

• Verify axle configuration before ordering: 9 in. ring gear with Spicer 50 axle, 9.75 in. ring gear with Spicer 60 axle, and Monobeam axle notes appear in the fitment data.
• Confirm the housing bore, shaft diameter, and seal orientation before installation.
• Inspect the axle shaft surface for wear, scoring, or corrosion that could affect sealing.
• Clean the bore and sealing surface thoroughly before pressing the seal into place.
• Use the exact fitment notes for the vehicle year and axle setup listed below.

Quality Assurance

National is a long-established sealing brand with a reputation built on axle and oil seal applications. Part number 710925 is manufactured to the listed dimensional specifications for the confirmed Ford fitments shown here.

Vehicle Fitment

• Fits 2005-2018 Ford F-250 Super Duty, front outer, Hand-Install Style; with 9 (in) Ring Gear; with Spicer 50 Axle; with Monobeam Axle
• Fits 2005-2016 Ford F-350 Super Duty, front outer, Hand-Install Style; with 9 (in) Ring Gear; with Spicer 50 Axle; with Monobeam Axle
• Fits 2018 Ford F-350 Super Duty, front outer, Hand-Install Style; with 9 (in) Ring Gear; with Spicer 50 Axle; with Monobeam Axle
• Fits 2005 Ford Excursion, front outer, Hand-Install Style; with 9.75 (in) Ring Gear; with Spicer 60 Axle; with Monobeam Axle
• Fits 2005 Ford Excursion, front outer, Hand-Install Style; with 9 (in) Ring Gear; with Spicer 50 Axle; with Monobeam Axle