FAG SS3883 Differential Pinion Seal - Rear

FAG SS3883 Differential Pinion Seal

The FAG SS3883 differential pinion seal is built for driveline sealing applications where keeping gear oil contained and contaminants out is critical. It uses Viton sealing material with a metal spring and auxiliary lip design to support a secure seal at the pinion area.

For drivers searching for a differential pinion seal for BMW 3 Series, BMW 5 Series, or other rear axle service applications, SS3883 provides the dimensional accuracy needed for a proper OE-style repair. This FAG SS3883 seal is specified with a 5.5 in bore diameter, 5.508 in outside diameter, and 3.252 in width.

Key Features

• Part number: SS3883
• FAG differential pinion seal for driveline and axle sealing service
• Seal type: metal, spring, and auxiliary lip
• Sealing material: Viton
• Bore diameter: 5.5 in (139.7 mm)
• Seal outside diameter: 5.508 in (139.903 mm)
• Seal width: 3.252 in (82.601 mm)
• Built to help retain lubricant and block dirt, dust, and moisture at the pinion seal location

Detailed Description

FAG SS3883 is a differential pinion seal engineered for precise sealing performance in axle and driveline assemblies. The Viton sealing material is selected for demanding undercar conditions, while the metal case, spring tension, and auxiliary lip help maintain contact at the sealing surface. If you are replacing a leaking pinion seal on a BMW 3 Series or BMW 5 Series rear differential, this part number is a direct reference point for the correct sealing dimensions.

This part cross-references SKF 32503 for the same application. It also cross-references Febi-Bilstein 100557 for the same application.

What It Helps Fix

• Gear oil seepage at the differential pinion area
• Contamination entering the axle seal interface
• Loss of lubricant from worn or hardened sealing surfaces
• Noise or driveline concerns associated with low differential fluid level
• Service issues during rear differential maintenance on BMW 3 Series and BMW 5 Series applications

Installation Notes and Tips

Inspect the pinion yoke and sealing surface before installation. Remove all old seal material, check for grooves or wear, and verify the bore and outside diameter match the housing specification. Proper alignment during installation is important to avoid premature leakage. Confirm the application by part number SS3883 and compare dimensions before final assembly.

Quality Assurance

FAG designs seals to meet vehicle manufacturer specifications and works with suppliers to maintain its quality standards. The SS3883 is built for demanding wheel-end and driveline sealing requirements where material selection and dimensional control matter.