InMotion WT31520 Differential Pinion Race - Front Inner, Rear Inner or Rear Outer

InMotion WT31520 Differential Pinion Race

The InMotion WT31520 differential pinion race is built for driveline service where bearing support, rotational stability, and friction control matter. Made from case carburized steel, it is engineered for consistent performance in front and rear axle applications across a wide range of Jeep, Ford, Dodge, Chevrolet, GMC, and Pontiac vehicles.

With a 3.00-inch outside diameter, 0.94-inch width, and 0.13-inch bearing cup radius, this pinion race is sized for specific axle setups that use Spicer 44-family and related assemblies. The WT31520 is a direct-fit service part for technicians and owners restoring axle smoothness on classic trucks and 4x4 platforms.

Key Features

• Case carburized steel construction for strength and wear resistance
• 3.00 in. outside diameter and 0.94 in. width for axle-specific fitment
• 0.13 in. bearing cup radius for proper bearing interface
• Used in front inner, rear inner, and rear outer positions depending on application
• Fits a broad range of Jeep Wrangler, Ford F-Series, and Dodge Ramcharger axle configurations
• InMotion WT31520 service part for differential pinion bearing repair

Detailed Description

The WT31520 differential pinion race is a precision bearing component used to support the pinion bearing in compatible axle assemblies. Its case carburized steel construction helps provide the hardness and durability needed in demanding driveline environments, including off-road Jeep applications and heavy-duty Ford and Dodge truck axles. This part number, WT31520, is listed across many Spicer 44 variants and related axle designs, making it a practical replacement for service work on older 4x4 and truck platforms.

Compatible vehicle coverage includes applications such as Jeep TJ and Wrangler front inner and rear outer positions, Ford F-250 and Bronco front inner positions, and Chevrolet K10, K20, and K5 Blazer front inner axle setups. It also appears in Dodge W100, W150, W200, and W250 front inner applications, along with several Jeep Wagoneer, Cherokee, J10, J20, and Grand Wagoneer rear inner configurations. If you are servicing a Jeep Wrangler, Ford F-Series, or Chevrolet/GMC 4x4 axle, WT31520 is a relevant pinion race to verify against the axle code and bearing dimensions.

This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

What It Helps Fix

• Pinion bearing wear or scoring in the differential
• Excess driveline noise from a damaged bearing race
• Rough pinion rotation during axle rebuilds
• Improper bearing support caused by worn race surfaces
• Restoration work on older Jeep, Ford, Dodge, Chevrolet, and GMC axles

Installation Notes and Tips

Verify axle type, bearing dimensions, and position before installation. This part is used in specific front inner, rear inner, and rear outer applications, so match the axle assembly exactly to the vehicle listing. During service, inspect the pinion bearing, seal surfaces, and related wear components to confirm the repair addresses the full source of noise or looseness. Proper press-fit installation and correct bearing preload are important for axle life and quiet operation.

Quality Assurance

InMotion manufactures this pinion race from case carburized steel for durability in automotive driveline service. The WT31520 is specified for a wide range of confirmed axle applications, supporting accurate replacement selection for differential rebuilds and bearing service.