National NP949481 Differential Pinion Race - Rear Inner

Overview

National NP949481 is a differential pinion race built for Ford rear axle applications that use a 10.5-inch ring gear and Ford differential. It is engineered for the rear inner position and uses premium-grade steel with crowned raceways for even load distribution.

Use this part for Ford F-150, F-250 Super Duty, and related heavy-duty applications where the specified axle setup is present. The NP949481 is also listed for select Lincoln and Ford van applications with the same differential configuration.

Key Features

• Premium-grade steel construction for bearing support in demanding driveline service.
• Crowned raceways promote even load distribution across the bearing surface.
• Designed for rear inner differential pinion applications.
• Fits Ford axle setups with a 10.5-inch ring gear and Ford differential.
• This part cross-references Ford (e.g., F81Z4628AA) for the same application.

Detailed Description

National NP949481 is a taper bearing cup used in the differential pinion assembly. Its crowned raceway profile helps distribute load more evenly, while the steel construction supports consistent operation in axle assemblies that see regular driveline stress. This part number is specified for multiple Ford truck, van, and SUV platforms, including Ford F-150, Ford F-250 Super Duty, and Ford Excursion applications with the correct rear inner differential setup. The NP949481 is a direct fit for the listed axle configuration and should be matched carefully to the ring gear and differential type noted in the fitment data.

What It Is Used For

• Replacing a worn or damaged differential pinion race.
• Addressing bearing noise from the rear axle assembly.
• Restoring proper pinion bearing support and alignment.
• Correcting uneven wear in the differential bearing surface.
• Servicing Ford rear axle assemblies with the specified differential configuration.

Installation Notes and Tips

Verify the axle configuration before ordering. This part is listed only for rear inner applications with a 10.5-inch ring gear and Ford differential. Match the part number NP949481 to the vehicle’s axle specification and inspect the related bearing components during service. Professional installation is recommended for differential bearing work because correct race seating and preload are critical to assembly performance.

Quality Assurance

National manufactures this bearing component with premium-grade steel and crowned raceways to support even load distribution in differential service.