InMotion WS5573 Wheel Seal Kit - Rear

Rear Differential Pinion Seal for Classic GM Applications

The InMotion WS5573 is a rear differential pinion seal built with nitrile sealing material for a secure barrier against contaminants and fluid loss. It is sized for a 1.915 in inside diameter, 2.548 in outside diameter, and 0.25 in width to support a precise seal at the pinion shaft.

Compatible With classic Chevrolet and Pontiac rear axle applications, including Chevrolet Bel Air, Impala, El Camino, and Corvette, as well as Pontiac Laurentian and Parisienne. The WS5573 is a direct-fit service part for restoring sealing performance in the differential pinion area.

Key Features

• Brand: InMotion
• Part number: WS5573
• Wheel seal kit category for driveline and axle service
• Nitrile sealing material for dependable fluid sealing
• Inside diameter: 1.915 in
• Outside diameter: 2.548 in
• Width and thickness: 0.25 in
• Fits rear position applications

Detailed Description

InMotion WS5573 is engineered as a rear differential pinion seal for vehicles that require accurate shaft sealing and contamination control. Its nitrile construction helps maintain a tight seal at the pinion area, reducing the chance of gear oil leaks and helping protect internal differential components from moisture and debris. This makes it a practical service replacement for older rear axle assemblies where seal integrity is critical.

Fits 1958-1964 Chevrolet Bel Air, rear; Fits 1959-1964 Pontiac Parisienne, rear; Fits 1960-1962 Chevrolet Corvette, rear without Posi-Traction. The WS5573 also applies to Chevrolet Impala, Chevrolet El Camino, and Pontiac Laurentian rear applications listed in the fitment data. If you are servicing a Chevrolet Bel Air rear differential or a Pontiac Parisienne rear axle, WS5573 provides the dimensional match needed for the pinion seal location.

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

What It Helps Solve

• Rear differential gear oil seepage at the pinion seal
• Contamination entering the differential pinion area
• Moisture intrusion around the pinion shaft seal surface
• Seal wear on classic Chevrolet and Pontiac rear axle assemblies
• Loss of sealing performance during driveline service

Installation Notes and Tips

Confirm shaft diameter, seal OD, and width before installation to match the housing and pinion dimensions. Inspect the pinion yoke and sealing surface for grooves, corrosion, or wear before pressing in the new seal. Clean the bore thoroughly and install the seal squarely to avoid distortion. Verify rear axle configuration, especially on 1960-1962 Chevrolet Corvette applications listed without Posi-Traction.

Quality Assurance

InMotion manufactures this seal with precision-focused construction and nitrile sealing material to support reliable service in driveline applications. The WS5573 is built to provide consistent sealing performance for compatible rear differential pinion service on classic Chevrolet and Pontiac vehicles.