National 28985 Axle Differential Bearing - Rear

National 28985 Axle Differential Bearing

National 28985 is a taper bearing cone for axle differential service, built with premium-grade steel and crowned raceways and rollers for even load distribution. It is a direct-fit bearing component for driveline repair work where precise cone dimensions matter.

Key Features

• Taper bearing cone for axle differential applications
• Premium-grade steel construction
• Crowned raceways and rollers for more even load distribution
• Cone bore: 2.3750 in. / 60.3250 mm
• Cone length: 1.0000 in. / 25.4000 mm
• Cone radius: 0.1400 in. / 3.5560 mm
• National 28985 cross-references SKF BR28985 for the same application

Detailed Description

National 28985 is a taper bearing cone used in axle differential bearing service where stable rotation and accurate fit are required. The premium-grade steel construction supports durability, while the crowned raceway and roller profile helps distribute load more evenly across the bearing surface. For driveline repairs on vehicles such as Ford F-250 and Ford F-350, matching the cone bore, length, and radius is essential for proper differential bearing setup. This part number, 28985, is also listed across multiple interchange references, making it a practical replacement choice when verifying OE-style dimensions.

What It Helps Address

• Noise from worn axle differential bearings
• Excessive play in the differential bearing assembly
• Rough rotation caused by bearing surface wear
• Incorrect bearing fit during driveline service
• Restoration of proper axle support in differential repair

Installation Notes and Tips

Confirm cone bore, cone length, and cone radius before installation. Inspect the mating race, axle components, and differential surfaces for wear or scoring, and replace damaged related parts as needed. Proper bearing preload and setup are critical during installation, so follow the vehicle service procedure for the specific axle and differential assembly. Fits should be verified by measurement and application data before final assembly.

Quality Assurance

National manufactures this bearing cone with premium-grade steel and a crowned roller profile to support consistent load distribution in driveline service. Part number 28985 is built to meet the dimensional requirements expected in axle differential bearing applications.