FAG SS3085 Differential Pinion Seal - Rear or Rear Rearward

Rear Differential Pinion Seal for GM Applications

The FAG SS3085 differential pinion seal is built for rear axle service where reliable sealing is critical. It uses Viton sealing material with a metal case, spring, and auxiliary lip to help retain lubricant and keep contamination out of the differential.

Compatible With select Chevrolet, GMC, Cadillac, and Hummer rear axle applications, including many Silverado 1500, Sierra 1500, Tahoe, Yukon, and Express van models. The FAG SS3085 is specified for multiple ring gear sizes and rear positions, making correct vehicle verification important before installation.

• Brand: FAG
• Part number: SS3085
• Differential pinion seal for rear axle service
• Viton sealing material for demanding drivetrain environments
• Metal, spring, and auxiliary-lip seal design
• Bore diameter: 73.939 mm / 2.911 in
• Seal outside diameter: 74.041 mm / 2.915 in
• Seal width: 12.7 mm / 2.088 in
• Cross-reference: Gates 20880

Detailed Application Overview

This FAG SS3085 seal is used at the differential pinion area to help maintain proper lubricant retention at the rear axle. It is listed across a wide range of GM vehicles, including rear applications on Chevrolet Silverado 1500, Chevrolet Tahoe, GMC Sierra 1500, and GMC Yukon, as well as Chevrolet Express and GMC Savana vans. The fitment data also includes Cadillac Escalade, Escalade ESV, Escalade EXT, and several Hummer models.

Because the same vehicle family may use different ring gear sizes or axle configurations, confirm the rear axle details and notes before ordering. The SS3085 part number is also associated with National 710507 and the Schaeffler global number 413 3085 100.

What This Seal Helps Address

• Gear oil seepage at the rear differential pinion area
• Contamination from dirt, dust, and moisture entering the axle
• Loss of lubricant that can affect bearing and gear life
• Noise or wear concerns related to a compromised pinion seal
• Service replacement needs on GM rear axle applications

Installation Notes and Tips

Verify the axle position, ring gear size, and any fitment notes before installation. Clean the sealing surface thoroughly and inspect the pinion yoke and surrounding components for wear or scoring that could affect seal performance. Proper installation depth and alignment are important for a reliable seal on rear differential service.

Quality Assurance

FAG designs seals using high-quality materials and application-specific specifications to meet vehicle manufacturer requirements. The SS3085 is engineered for drivetrain sealing performance in the listed GM rear axle applications.