National 710577 Differential Pinion Seal - Rear Outer

Overview

National 710577 is a differential pinion seal built for driveline sealing service where precise dimensions and durable sealing material matter. It is specified for rear outer applications on select Ford heavy-duty platforms, including Ford F-350 Super Duty and Ford F-450 Super Duty fitments.

Key Features

• Fluoro-elastomer sealing material for resistance to heat and fluid exposure.
• Measured to match the listed shaft, housing bore, and outside diameter dimensions.
• Oil seal design for differential pinion sealing service.
• National 710577 is part of the 710500 series.

Detailed Description

This National differential pinion seal is engineered around the listed dimensional specifications, including a 2.500-inch shaft size, 4.043-inch outside diameter, and 0.453-inch width. The fluoro-elastomer construction supports consistent sealing performance in demanding axle service, while the flanged profile and side-lip width help define the seal geometry for the intended application. For buyers searching for a Ford F-350 Super Duty rear outer differential pinion seal or a Ford F-450 Super Duty rear outer differential pinion seal, National 710577 provides a direct match to the published fitment and dimensions. This part cross-references SKF 24967A and Remy 25026 for the same application.

What It Is Used For

• Stopping gear oil seepage at the differential pinion area.
• Replacing a worn or hardened axle seal.
• Addressing fluid loss caused by seal wear or age.
• Restoring proper sealing after driveline service.

Installation Notes and Tips

Install only on the listed rear outer applications and verify the axle note before ordering. Confirm the housing bore, shaft diameter, and seal width against the removed part before installation. Clean the sealing surface thoroughly and inspect the pinion area for wear that could affect seal life.

Quality Assurance

National has supplied premium sealing solutions for more than 75 years and is recognized for sealing products used in automotive service applications. Part number 710577 reflects that sealing-focused product heritage.