National 710877 Differential Pinion Seal - Rear Outer

Differential Pinion Seal for Jeep Axles

The National 710877 differential pinion seal is built for rear outer axle service on select Jeep applications. It is a fluoro-elastomer oil seal with a clockwise-spiral lip design, sized for precise sealing at the pinion shaft and housing bore.

Use this seal when servicing the rear differential on Jeep Wrangler JK, Wrangler, Commander, and Grand Cherokee models equipped with the specified 8.5-inch ring gear and Spicer 44 axle setup. The National 710877 is engineered to match the dimensions and sealing profile needed for dependable driveline protection.

Key Features

• Part number: 710877
• Differential pinion seal / oil seal design
• Fluoro-elastomer material for sealing performance
• Clockwise-spiral lip design
• Inside diameter: 1.807 in. / 45.900 mm
• Outside diameter: 3.168 in. / 80.460 mm
• Flanged outside diameter: 3.425 in. / 87.000 mm
• Thickness: 0.563 in. / 14.300 mm
• Housing bore: 3.160 in. / 80.264 mm
• Shaft size: 1.875 in. / 47.625 mm

Detailed Description

National has supplied sealing products for more than 75 years, and the 710877 reflects that focus on dimensional accuracy and modern sealing materials. This differential pinion seal is part of the 710800 series and is designed to help maintain a proper seal at the pinion area where gear oil retention is critical. For Jeep Wrangler JK, Wrangler, Commander, and Grand Cherokee rear outer applications, the seal dimensions and lip design are matched to the axle service requirements listed in the fitment data. This part cross-references Mopar 68003265AA for the same application.

What It Helps Address

• Gear oil leakage at the differential pinion area
• Moisture or contamination entering the axle housing through a worn seal
• Noise or driveline concerns associated with low differential fluid level
• Seal wear from age, heat, or mileage
• Service replacement during rear axle maintenance on Jeep Wrangler JK, Wrangler, Commander, and Grand Cherokee models

Installation Notes and Tips

• Confirm axle configuration before ordering: rear outer, 8.5-inch ring gear, Spicer 44 axle.
• Inspect the pinion shaft surface and housing bore for wear, scoring, or corrosion before installation.
• Clean the sealing surface thoroughly so the lip can seat evenly.
• Verify the seal orientation during installation to match the spiral lip design.
• Check differential fluid level after service and inspect for leaks during road testing.

Quality Assurance

National designs sealing components for current vehicle service needs and uses fluoro-elastomer construction to support durable oil sealing performance. Part number 710877 is built to the listed dimensions for the confirmed Jeep applications and is backed by National’s long-standing sealing product expertise.