FAG SS2556 Differential Pinion Seal - Front

FAG SS2556 Differential Pinion Seal

The FAG SS2556 differential pinion seal is built for front driveline applications that need reliable sealing at the pinion area. It uses Viton sealing material with a metal spring and auxiliary lip design to help keep gear oil contained while blocking dirt, dust, and moisture.

Compatible With select Chevrolet Trailblazer, GMC Envoy, and related front differential applications, this seal is specified for vehicles that require precise bore and outside diameter dimensions. The FAG SS2556 is a direct-fit style service part for maintaining proper differential sealing performance.

Key Features

• Part number: SS2556
• Seal type: metal, spring, auxiliary lip
• Sealing material: Viton
• Bore diameter: 2.656 in. / 67.462 mm
• Seal outside diameter: 2.664 in. / 67.666 mm
• Seal width: 1.521 in. / 38.633 mm
• Designed for front differential pinion sealing applications
• Cross-reference part numbers include Four Seasons 14946 and National 710547

Detailed Description

FAG SS2556 is a differential pinion seal engineered to meet vehicle-specific sealing requirements with a Viton sealing element and reinforced metal spring construction. The auxiliary lip helps manage contamination at the seal interface, while the dimensional specifications support proper fit in the differential housing. This part number is commonly searched for front differential service on Chevrolet Trailblazer, GMC Envoy, and related GM platforms, including applications listed for Chevrolet Trailblazer EXT, GMC Envoy XL, Buick Rainier, Saab 9-7x, and Isuzu Ascender.

This part cross-references Four Seasons 14946 and National 710547 for the same application.

Common Repair Symptoms

• Gear oil leaking from the front differential pinion area
• Contamination entering the seal area from road debris, dust, or moisture
• Oil residue around the pinion yoke or differential housing
• Loss of lubricant that can affect differential operation
• Seal wear on front driveline service intervals

Installation Notes and Tips

• Verify bore diameter, outside diameter, and width before installation.
• Inspect the pinion yoke and sealing surface for wear or scoring.
• Clean the housing thoroughly before pressing in the new seal.
• Confirm the vehicle application by year, make, model, and front position.
• Use the listed fitment data for Chevrolet Trailblazer, GMC Envoy, Buick Rainier, Saab 9-7x, and other supported front applications.

Quality Assurance

FAG specifies high-quality materials and application-based engineering for sealing components used in driveline service. The SS2556 is built to meet vehicle manufacturer requirements for the listed front differential applications, including 2002-2009 Chevrolet Trailblazer, 2002-2009 GMC Envoy, and related models.