FAG SS5403 Differential Pinion Seal - Front

FAG SS5403 Differential Pinion Seal Overview

The FAG SS5403 differential pinion seal is built for driveline sealing applications where keeping gear oil contained and contaminants out matters. With a metal seal type and polyacrylate sealing material, it is specified for select front and rear axle applications across Ford Super Duty, Chevrolet Express 2500, and GMC Savana 2500 platforms.

Use this seal when servicing a differential pinion area that requires a precise bore and outside diameter match. The FAG SS5403 is engineered to meet vehicle manufacturer specifications and is identified by cross-reference part numbers used in the same application.

Key Features

• Part number: SS5403
• Metal seal type with polyacrylate sealing material
• Bore diameter: 3.16 in. / 80.264 mm
• Seal outside diameter: 3.165 in. / 80.391 mm
• Seal width: 1.875 in. / 47.625 mm
• Designed for differential pinion sealing in driveline and axle service
• Cross-references SKF 18730 and FAG global number 4135403100

Detailed Description

FAG SS5403 is a differential pinion seal designed for axle and driveline repair where accurate sealing dimensions are critical. The listed measurements help ensure proper seating at the bore and consistent contact at the sealing surface, while the polyacrylate material is selected for sealing performance in demanding wheel-end and axle environments. This part number is used across multiple applications, including 2003-2017 Chevrolet Express 2500 rear, 2003-2017 GMC Savana 2500 rear, and select Ford Super Duty front axle configurations such as 1999-2013 Ford F-250 Super Duty front and 2001-2016 Ford F-350 Super Duty front.

This part cross-references SKF 18730 and FAG global number 4135403100 for the same application.

What This Seal Helps Address

• Gear oil leakage at the differential pinion area
• Contamination from dirt, dust, and moisture entering the axle assembly
• Seal wear that can lead to fluid loss over time
• Service replacement needs on Ford Super Duty front axles
• Rear axle seal service on Chevrolet Express 2500 and GMC Savana 2500

Installation Notes and Tips

• Verify bore diameter, outside diameter, and seal width before installation.
• Confirm axle configuration and position, especially on Ford Super Duty applications with Dana 60 or Spicer 60 axle notes.
• Inspect the pinion surface and surrounding housing for wear, scoring, or contamination before installing the new seal.
• Use the exact vehicle application data to match front or rear position correctly.

Quality Assurance

FAG designs seals to meet vehicle manufacturer specifications and works with suppliers to maintain its quality standards. The SS5403 is built for demanding axle sealing requirements and is specified for multiple OE-style applications across Ford, Chevrolet, and GMC driveline service.