National 710428 Drive Axle Shaft Seal - Front Right

Drive Axle Shaft Seal for Ford and Mazda

National 710428 is a drive axle shaft seal built for front right applications on select Ford, Mazda, Mercury, and Lincoln vehicles. It uses a fluoro-elastomer sealing material and a bi-directional lip design to help maintain a consistent seal at the axle shaft and housing interface.

Compatible With 1995-2011 Ford Explorer, Explorer Sport, Explorer Sport Trac, Ranger, 1998-2010 Mazda B4000 and B3000, 1997-2010 Mercury Mountaineer, and 2003-2005 Lincoln Aviator front right applications with the listed axle and ring gear configurations.

• Part number: 710428
• Drive axle shaft seal / oil seal for front right placement
• Fluoro-elastomer construction for sealing performance
• Bi-directional lip design for sealing in either rotational direction
• Inside diameter: 1.732 in. / 44.000 mm
• Outside diameter: 2.621 in. / 66.580 mm
• Flanged outside diameter: 3.125 in. / 79.380 mm
• Thickness: 0.394 in. / 10.000 mm
• Housing bore: 2.614 in. / 66.400 mm

Detailed Product Overview

National 710428 is part of National’s 710400 series and is engineered as a precision oil seal for driveline and axle sealing service. The seal dimensions are specified in both inch and metric units, including a 44.000 mm shaft diameter, 66.580 mm outside diameter, and 10.000 mm width, which helps support accurate replacement selection for the correct axle housing and shaft fitment. This part cross-references Dorman - HELP 46066 for the same application.

For Ford Ranger, Ford Explorer, Ford Explorer Sport Trac, Mazda B4000, Mazda B3000, Mercury Mountaineer, and Lincoln Aviator front right service, National 710428 is the direct-fit style seal used where the listed differential and axle configurations apply. The National 710428 part number is commonly searched alongside front right axle seal replacement terms for these vehicles.

Common Problems This Seal Addresses

• Gear oil seepage at the front right axle shaft seal
• Contamination entering the axle housing through a worn seal
• Fluid loss caused by hardened or damaged sealing lips
• Noise or driveline wear related to low lubricant level
• Leak repair during differential or axle service

Installation Notes and Tips

Verify shaft diameter, housing bore, and axle configuration before installation. This seal is listed for front right applications only, and fitment depends on the ring gear and axle type noted for each vehicle. Clean the bore and shaft sealing surface thoroughly, and inspect for grooves, corrosion, or damage that could affect sealing performance. Confirm the vehicle application against the listed notes for Ford Ranger, Ford Explorer, and Mazda B4000 front right axle seal replacement.

Quality Assurance

National has supplied sealing products for more than 75 years and focuses on updated sealing solutions for modern vehicles. The 710428 is built as a technical replacement oil seal for driveline service, with material and dimensional specifications provided for accurate application matching.