InMotion WS3385 Wheel Seal - Rear Inner

InMotion WS3385 Differential Pinion Seal

The InMotion WS3385 is a nitrile differential pinion seal built to create a tight barrier at the pinion shaft. It helps keep moisture and road debris out while helping retain differential lubricant for consistent rear axle operation.

Key Features

• Nitrile construction for sealing performance and fluid resistance
• Inside diameter: 3.18 in.; shaft diameter: 3.18 in.
• Outside diameter: 4.185 in.; housing bore: 4.18 in.
• Width: 0.75 in. for a precise fit in the housing
• Direct replacement style for rear inner applications
• Part number WS3385 for easy identification

Fitment and Application

Compatible with rear inner applications on select Ford E-350 Econoline and Ford E-350 Econoline Club Wagon models. Fits 1976 Ford E-350 Econoline, rear inner; Fits 1977-1980 Ford E-350 Econoline, rear inner, with Dual Rear Wheels (DRW); Fits 1977-1980 Ford E-350 Econoline Club Wagon, rear inner, with Dual Rear Wheels (DRW).

This part cross-references no listed interchange numbers for the same application.

What It Helps Address

• Differential pinion seal leaks
• Contamination from dirt, water, and road debris
• Lubricant loss at the pinion area
• Wear caused by compromised sealing surfaces

Installation Notes and Tips

Verify the housing bore and shaft dimensions before installation. Clean the sealing surface thoroughly and inspect the pinion area for wear or damage that could affect seal performance. Confirm rear inner placement and DRW configuration on Ford E-350 Econoline and Ford E-350 Econoline Club Wagon applications before ordering.

Quality Assurance

InMotion manufactures this seal with precision-focused construction and high-quality materials to support reliable differential sealing. The WS3385 is engineered to help maintain a secure seal under everyday driving and demanding road conditions.