FAG SS6378 Transfer Case Output Shaft Seal - Front

Transfer Case Output Shaft Seal for GM SUVs

FAG SS6378 is a transfer case output shaft seal built for front-position applications on select Chevrolet, GMC, Saab, Isuzu, Buick, and Oldsmobile SUVs. It uses Viton sealing material with a rubber seal body, spring, and auxiliary lip to help retain lubricant and block contamination at the transfer case output shaft.

Key Features

• Transfer case output shaft seal for front applications
• Viton sealing material for demanding drivetrain sealing conditions
• Rubber seal design with spring and auxiliary lip
• Bore diameter: 2.244 in. / 56.998 mm
• Seal outside diameter: 2.252 in. / 57.201 mm
• Seal width: 1.376 in. / 34.95 mm
• Cross-reference part numbers include SKF 13730 and FAG global number 4136378100

Detailed Description

FAG SS6378 is engineered as a transfer case output shaft seal for vehicles such as the Chevrolet Trailblazer, GMC Envoy, and Saab 9-7x. The seal dimensions and material selection are matched to the demands of drivetrain sealing, helping maintain a barrier against dirt, dust, and moisture while supporting lubricant retention at the shaft interface. This part number, SS6378, is listed for front-position fitments across multiple GM-platform SUVs from 2002 through 2009.

This part cross-references SKF 13730 and FAG global number 4136378100 for the same application.

Vehicle Fitment

• Fits 2002-2009 Chevrolet Trailblazer, front
• Fits 2002-2006 Chevrolet Trailblazer EXT, front
• Fits 2002-2009 GMC Envoy, front
• Fits 2002-2006 GMC Envoy XL, front
• Fits 2004-2005 GMC Envoy XUV, front
• Fits 2005-2009 Saab 9-7x, front
• Fits 2003-2008 Isuzu Ascender, front
• Fits 2004-2007 Buick Rainier, front
• Fits 2002-2004 Oldsmobile Bravada, front

What It Helps Address

• Transfer case fluid seepage at the output shaft
• Contamination from road dirt, dust, and moisture
• Loss of lubricant around the shaft seal area
• Wear-related sealing issues in front transfer case service
• Noise or driveline concerns linked to low fluid retention

Installation Notes and Tips

Verify the bore diameter, seal outside diameter, and seal width against the original part before installation. Inspect the shaft surface and housing for scoring, corrosion, or debris, since seal performance depends on a clean, smooth sealing surface. Confirm front-position application and vehicle-specific fitment for the Chevrolet Trailblazer, GMC Envoy, and related models before service.

Quality Assurance

FAG designs sealing components to meet vehicle manufacturer specifications and works with suppliers to maintain its quality standards. The SS6378 uses Viton sealing material and a multi-lip design to support consistent sealing performance in transfer case service.