FAG SS3857 Differential Pinion Seal - Rear

Reliable Differential Pinion Seal for Driveline Systems

The FAG SS3857 differential pinion seal is engineered to provide durable sealing performance in driveline and axle applications. Designed with precision, this seal helps maintain optimal differential function by preventing fluid leaks and contamination.

• Seal Type: Metal construction with spring, auxiliary lip, and inner shell for enhanced sealing
• Sealing Material: Polyacrylate for resistance to heat and wear
• Bore Diameter: 107.925 mm (4.249 inches) ensuring a precise fit
• Seal Outside Diameter: 108.052 mm (4.254 inches) for secure installation
• Seal Width: 11.125 mm (2.75 inches) providing effective sealing depth

Technical Details and Construction

The FAG SS3857 differential pinion seal features a metal design incorporating a spring and auxiliary lip, supported by an inner shell to maintain consistent pressure against the shaft. The polyacrylate sealing material offers excellent resistance to automotive fluids and high temperatures, making it suitable for demanding driveline environments. With a bore diameter of approximately 108 mm and a width of 11.125 mm, this seal fits tightly to prevent leaks and protect the differential assembly from dirt and debris.

Applications and Problem Solving

• Prevents differential oil leaks that can lead to drivetrain damage
• Protects against contamination from dirt and moisture entering the differential
• Maintains proper lubrication levels within the differential housing
• Reduces wear on pinion bearings by ensuring a clean operating environment
• Helps avoid costly repairs related to seal failure in vehicles such as Ford F-150, Chevrolet Silverado, and Dodge Ram

Installation Notes and Tips

When installing the FAG SS3857 differential pinion seal, ensure the bore and shaft surfaces are clean and free of debris. Use appropriate tools to press the seal evenly into place without damaging the sealing lips or metal components. Verify the seal orientation matches the original part to maintain proper sealing function. It is recommended to inspect the pinion shaft and bearing surfaces for wear before installation.

Quality Assurance and Warranty

FAG manufactures the SS3857 differential pinion seal to meet strict quality standards for durability and performance in automotive driveline applications. The use of high-grade polyacrylate sealing material and robust metal construction ensures long service life. While specific warranty details are not provided, FAG products typically adhere to industry standards for reliability and fitment.