National 127591 Differential Pinion Seal - Rear Outer

Differential Pinion Seal for Driveline Service

The National 127591 differential pinion seal is an oil seal built for driveline and axle sealing applications where the pinion area must stay protected from gear oil leakage. With a bi-directional lip design and polyacrylate construction, this seal is built around the dimensions needed for a precise housing and shaft interface.

Use this National 127591 seal when servicing differential leaks on applications that call for a 2.913-inch shaft diameter, 4.567-inch outside diameter, and 1.004-inch width. It is a direct-fit sealing component for repair work on driveline and axle assemblies.

Key Features

• Differential pinion seal / oil seal for driveline and axle sealing service
• Bi-directional lip design for sealing performance at the pinion interface
• Polyacrylate material for durability in demanding drivetrain environments
• Inside diameter: 2.913 in. / 74.000 mm
• Outside diameter: 4.567 in. / 116.000 mm
• Flanged outside diameter: 5.000 in. / 127.000 mm
• Width / thickness: 1.004 in. / 25.500 mm
• Housing bore: 4.561 in. / 115.850 mm
• National Series 120000 seal design

Detailed Description

National 127591 is a differential pinion seal engineered for axle and driveline sealing applications where accurate dimensions matter. The seal’s 2.913-inch shaft size, 4.567-inch outside diameter, and 4.561-inch housing bore help support a proper fit in the differential housing, while the bi-directional lip design is suited to sealing movement at the pinion area. National has focused on sealing solutions for more than 75 years, and this part reflects that experience in a practical replacement oil seal.

This part cross-references SKF 29528 and Timken 73912 for the same application. For vehicle-specific searches, use National 127591 when looking for differential pinion seal replacement on Chrysler, Dodge, and Jeep driveline service applications.

What It Helps Address

• Gear oil leaking from the differential pinion area
• Wet or oily residue around the pinion seal location
• Seal wear from age, heat, or drivetrain movement
• Loss of sealing integrity during differential service
• Replacement needs on Chrysler, Dodge, and Jeep axle applications

Installation Notes and Tips

Confirm shaft diameter, housing bore, and seal width before installation to match the differential housing exactly. Inspect the pinion yoke and sealing surface for wear or grooves before installing the new seal, since surface damage can affect sealing performance. Clean the bore thoroughly and install the seal squarely to avoid distortion. For fitment-based searches, this part is commonly referenced for Chrysler, Dodge, and Jeep differential pinion seal service, including Chrysler, Dodge, and Jeep driveline repair queries.

Quality Assurance

National is a long-established sealing brand with a history of supplying premium sealing solutions and updating designs for modern vehicles. The 127591 seal is built to the listed dimensional specifications and material requirements for differential sealing service.