InMotion WS370023A Wheel Seal - Rear Inner

Wheel Seal for Differential Pinion Service

The InMotion WS370023A wheel seal is built for differential pinion sealing applications where keeping lubricant in and contaminants out matters. Made from nitrile with an AISI 1070 seal case, it provides a precise sealing interface for driveline service on vehicles such as Ford F-150 and Chevrolet Silverado applications that use this style of seal.

Use WS370023A when you need a replacement differential pinion seal that matches the housing and shaft dimensions specified for the application. The part number WS370023A is also marked externally as P370023A for identification during service.

Key Features

• Nitrile sealing material for dependable fluid resistance
• AISI 1070 seal case material for structural support
• Outside diameter: 5.70 in. / 144.8 mm
• Housing bore: 5.689 in. / 144.5 mm
• Shaft diameter: 3.875 in. / 98.4 mm
• Width: 0.880 in. / 22.3 mm
• External marking: P370023A
• Part number: WS370023A

Detailed Description

InMotion WS370023A is a differential pinion seal engineered to create a tight barrier at the pinion area, helping protect sensitive internal differential components from moisture, road debris, and lubricant loss. The nitrile sealing element is paired with a steel seal case to maintain shape and sealing consistency under driveline operating conditions. For buyers searching for a differential pinion seal for Ford F-150 or Chevrolet Silverado driveline repair, this part number WS370023A provides the dimensional details needed to verify application match before service.

This seal is suited to differential service where accurate housing bore, shaft diameter, and outside diameter measurements are critical. It is a practical choice for technicians replacing a leaking pinion seal during axle or differential maintenance.

What It Helps Address

• Differential pinion oil leaks
• Contamination entering the pinion seal area
• Lubricant loss from worn sealing surfaces
• Noise or wear concerns related to low differential fluid
• Service replacement for a damaged or aged pinion seal

Installation Notes and Tips

Verify housing bore, shaft diameter, and seal width against the original part before installation. Clean the sealing surface and inspect the pinion area for wear, scoring, or contamination that could affect seal life. Proper alignment during installation is important to avoid distortion of the nitrile sealing lip. Confirm the application by matching WS370023A and the external marking P370023A to the removed component when possible.

Quality Assurance

InMotion manufactures this seal with precision-focused construction and durable materials for differential service. No warranty information was provided in the product data.