InMotion WS414045 Wheel Seal - Rear

Rear Differential Pinion Seal for Buick Applications

InMotion WS414045 is a rear differential pinion seal built with nitrile material for a secure sealing surface around the pinion shaft. It helps keep gear oil in place while blocking dirt and moisture from entering the differential housing.

Key Features

• Nitrile construction for dependable sealing performance
• Inside diameter: 1.875 in.
• Outside diameter: 2.786 in.
• Width: 0.5 in.
• Shaft diameter: 1.875 in.
• Housing bore: 2.782 in.
• Rear position application
• Part number: WS414045

Detailed Description

This InMotion wheel seal is specified for rear differential pinion service and is sized to match the listed shaft and housing dimensions. It is a direct-fit sealing component for 1950-1955 Buick Roadmaster rear, 1954-1955 Buick Century rear, and 1954 Buick Skylark rear applications. For buyers searching for a rear differential pinion seal for 1954 Buick Skylark or a 1950-1955 Buick Roadmaster rear seal, WS414045 provides the dimensional match needed for service work. The nitrile sealing material is selected for resistance to common drivetrain fluids and for maintaining a consistent barrier at the pinion opening. WS414045 is also a practical choice when replacing a worn rear differential seal on Buick Century and Roadmaster models.

What It Helps Address

• Gear oil seepage at the differential pinion area
• Contamination from road debris and moisture entering the housing
• Seal wear that can lead to fluid loss
• Maintenance needs on rear differential service jobs
• Noise or driveline issues associated with low lubricant level

Installation Notes and Tips

Confirm shaft diameter, housing bore, and width before installation to match the existing differential housing. Inspect the pinion surface for wear or scoring before pressing in the new seal, and verify the sealing lip seats evenly during assembly. Clean the housing bore thoroughly so the seal can sit squarely and maintain proper contact.

Quality Assurance

InMotion manufactures this seal with precision-focused construction and high-quality materials for drivetrain sealing service. Part number WS414045 is built to the listed dimensions for the specified Buick rear applications.