InMotion WS9864S Wheel Seal - Rear or Rear Inner

Rear Inner Differential Pinion Seal for Ford

The InMotion WS9864S is a precision-engineered differential pinion seal built to keep contaminants out and lubricant in. With a nitrile sealing element and durable steel case and spring materials, it is made for rear inner applications on a wide range of Ford E-Series vans and Ford F-Series trucks.

Use this seal when servicing a Ford E-250 Econoline, Ford E-350 Super Duty, or Ford F-350 rear axle and you need a reliable barrier at the pinion area. The WS9864S is sized for the specified shaft and housing dimensions to help maintain a tight seal at the differential.

Key Features

• Part number WS9864S differential pinion seal
• Nitrile sealing material for dependable fluid control
• Spring material: SAE 1008
• Seal case material: SAE 1070
• Inside diameter: 2.87 in. / 72.8 mm
• Outside diameter: 3.88 in. / 98.6 mm
• Width: 0.515 in. / 13.1 mm
• Shaft diameter: 2.875 in. / 73 mm
• Housing bore: 3.875 in. / 98.4 mm
• External markings: none

Detailed Description

InMotion WS9864S is designed for rear inner differential pinion sealing where accurate dimensions matter. The nitrile construction helps form a secure seal against debris and moisture, while the steel spring and case materials add structural support for consistent sealing performance. This makes it a practical choice for Ford driveline service on vehicles such as the E-350 Super Duty, E-250 Econoline, and F-350.

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

What It Helps Address

• Gear oil seepage at the differential pinion area
• Contamination from road debris and moisture
• Seal wear from age, heat, and driveline use
• Service issues on rear inner axle assemblies
• Maintenance needs on Ford E-Series and F-Series rear differentials

Installation Notes and Tips

• Confirm the shaft diameter, housing bore, and seal dimensions before installation.
• Inspect the pinion yoke and sealing surface for wear or scoring.
• Clean the bore and surrounding area thoroughly before pressing in the new seal.
• Verify axle configuration and notes for your vehicle, including DRW, SRW, full-floating, Spicer 61, or Spicer 70 applications where listed.
• For fitment, this part fits 2021-2023 Ford E-350 Super Duty, rear; 2006-2019 Ford E-350 Super Duty, rear inner; 2003-2006 Ford E-250, rear inner; 2003-2005 Ford E-350 Club Wagon, rear inner; 1999-2005 Ford E-350 Super Duty, rear inner; 1989-2002 Ford E-250 Econoline, rear inner; 1992-2002 Ford E-350 Econoline Club Wagon, rear inner; 1992-1998 Ford E-350 Econoline, rear inner; 1989-1991 Ford E-250 Econoline Club Wagon, rear inner; 1981-1991 Ford E-350 Econoline, rear inner; 1981-1991 Ford E-350 Econoline Club Wagon, rear inner; 1981-1988 Ford E-250 Econoline, rear inner, with Spicer 61 Axle; 1981-1988 Ford E-250 Econoline Club Wagon, rear inner, with Spicer 61 Axle; 1985 Ford F-250, rear inner, with Spicer 61 Axle; 1980-1982 Ford F-250, rear inner, with Spicer 61 Axle; 1984-1985 Ford F-350, rear inner, with Spicer 70 Axle; 1980-1981 Ford F-350, rear inner, with Spicer 70 Axle; 1983-1984 Ford F-250, rear inner, with Spicer 70 Axle; 1982-1983 Ford F-350, rear inner, with Spicer 61 Axle; 1980 Ford E-250 Econoline, rear inner; 1980 Ford E-250 Econoline Club Wagon, rear inner; 1975-1980 Ford E-350 Econoline, rear inner, with Single Rear Wheels (SRW); 1977-1980 Ford E-350 Econoline Club Wagon, rear inner, with Single Rear Wheels (SRW); 1968-1979 Ford F-350, rear inner; and 1967 Ford F-350, rear inner, 3.88in outside diameter.

Quality Assurance

Built by InMotion with precision sizing and durable sealing materials, WS9864S is intended for demanding driveline service where a stable differential seal is required. Its material selection and dimensional specifications support consistent fitment across the listed Ford rear inner applications.