InMotion WS9161 Wheel Seal - Rear

Rear Differential Pinion Seal for Mustang

The InMotion WS9161 is a nitrile wheel seal built to help maintain a secure barrier at the differential pinion area. It is specified for 1967-1970 Ford Mustang rear applications with 24 splines, making it a direct-fit option for service work on classic Mustang driveline components.

Key Features

• Nitrile seal material for dependable sealing performance
• Inside diameter: 1.326 in.
• Outside diameter: 2.316 in.
• Width: 0.435 in.
• Shaft diameter: 1.326 in.
• Housing bore: 2.312 in.
• Fits rear differential pinion applications with 24 splines

Detailed Description

Built for the rear driveline, the InMotion WS9161 helps seal the differential pinion area against moisture and debris that can affect internal components. Its nitrile construction is selected for sealing consistency, while the listed dimensions support accurate fitment in the housing and on the shaft. This part is a practical choice for restoring sealing integrity on 1967-1970 Ford Mustang rear differentials, including 1967 Ford Mustang, rear; 1968 Ford Mustang, rear; 1969 Ford Mustang, rear; and 1970 Ford Mustang, rear with 24 splines. The WS9161 is also a useful reference when searching for a Ford Mustang rear differential pinion seal or InMotion WS9161 replacement seal.

What It Helps Address

• Gear oil seepage at the differential pinion area
• Contamination from road debris and moisture
• Wear-related sealing loss in the rear differential
• Service needs during differential maintenance or rebuilds
• Fitment issues when replacing a worn Mustang rear pinion seal

Installation Notes and Tips

Verify the housing bore, shaft diameter, and spline count before installation. Clean the sealing surfaces thoroughly and inspect the pinion yoke and surrounding components for wear or scoring that could affect seal life. For best results, install the seal squarely to avoid distortion and confirm proper seating before returning the vehicle to service. This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

Quality Assurance

InMotion manufactures this seal with precision-focused dimensions and high-quality materials to support reliable sealing performance in differential service applications.