FAG SS2373 Differential Pinion Seal - Rear

FAG SS2373 Differential Pinion Seal

The FAG SS2373 differential pinion seal is built for rear axle sealing where contamination control and lubricant retention matter. It is a metal and spring seal with nitrile sealing material, sized for precise bore and outside diameter fitment in select Ford Mustang rear applications.

Key Features

• Part number: SS2373
• Seal type: metal with spring
• Sealing material: nitrile
• Bore diameter: 2.312 in. / 58.725 mm
• Seal outside diameter: 2.316 in. / 58.826 mm
• Seal width: 1.328 in. / 10.998 mm
• Designed to help keep dirt, dust, and moisture out of wheel end components
• Built to help retain grease over bearing service life

Detailed Description

FAG SS2373 is a differential pinion seal engineered for demanding axle sealing applications. Its nitrile sealing element and metal spring construction are selected to maintain sealing contact while helping protect internal components from contamination and lubricant loss. This seal is listed for rear fitment on 1967-1970 Ford Mustang applications, including 1968 Ford Mustang rear with 1.375-inch diameter 28 spline axle shaft, 1969-1970 Ford Mustang rear with WCY axle and 4 spline shaft, and 1969 Ford Mustang rear with 28 and 31 spline axle shaft and 9.00-inch ring gear. This part cross-references Anchor 9161 and BBB Industries 13419 for the same application. The SS2373 part number is also referenced in interchange data as 4132373100.

What It Helps Address

• Gear oil seepage at the rear differential pinion area
• Contamination from dirt, dust, and moisture entering the seal area
• Loss of grease or lubricant around axle and bearing components
• Seal wear in rear axle service on Ford Mustang applications
• Noise or driveline issues related to compromised sealing surfaces

Installation Notes and Tips

Verify axle configuration, ring gear size, and spline count before ordering, since the listed Ford Mustang rear applications include multiple rear-end setups. Inspect the sealing surface, pinion yoke, and surrounding components for wear or scoring before installation. Proper alignment and clean mating surfaces are important for consistent sealing performance.

Quality Assurance

FAG designs seals to meet vehicle manufacturer specifications and works with suppliers to maintain FAG quality standards. The SS2373 is built to the dimensional and material requirements listed above for the specified rear axle applications.