National 710658 Transfer Case Input Shaft Seal

Transfer Case Input Shaft Seal for Borg-Warner 4485/4484

National 710658 is a transfer case input shaft seal built for full-time 4WD applications that use Borg-Warner 4485 and 4484 transfer cases. It is sized for a 1.886 in. shaft and a 2.756 in. outside diameter, with a polyacrylate sealing material and bi-directional lip design for sealing performance in rotating driveline applications.

Key Features

• Transfer case input shaft seal for the National 710658 application
• Inside diameter: 1.886 in. / 47.900 mm
• Outside diameter: 2.756 in. / 70.000 mm
• Width: 0.335 in. / 8.500 mm
• Polyacrylate sealing material for durability in oil-sealing service
• Bi-directional lip design
• Housing bore: 2.750 in. / 69.850 mm
• Part description: oil seal

Detailed Description

National 710658 is an oil seal engineered for transfer case input shaft sealing in select Cadillac, Chevrolet, GMC, and Hummer 4WD vehicles. It is listed for full-time 4WD models with Borg-Warner 4485 transfer cases, including 2007-2014 Cadillac Escalade and Escalade ESV, 2009-2014 Chevrolet Silverado 1500, 2007-2014 GMC Yukon, and related applications. It also fits 2003-2009 Hummer H2 models with the Borg-Warner 4484 2-speed transfer case. National has supplied sealing solutions for more than 75 years, and this part reflects that focus on dimensional accuracy and drivetrain sealing.

This part cross-references SKF 18859A for the same application.

What It Helps Address

• Transfer case fluid seepage at the input shaft
• Oil leakage around the transfer case housing bore
• Seal wear from shaft rotation and driveline heat
• Contamination entering the transfer case through a worn seal
• Loss of sealing integrity in high-mileage 4WD service

Installation Notes and Tips

Verify shaft diameter, housing bore, and transfer case type before installation. This seal is specified for a 1.886 in. shaft and a 2.750 in. housing bore, so correct measurement is important for proper fit. Inspect the input shaft surface for grooves or damage before installing the new seal, and confirm the transfer case model matches the listed Borg-Warner 4485 or 4484 application.

Quality Assurance

National designs sealing components for modern vehicle service and has a long history in the sealing industry. Part number 710658 is built to the listed dimensional specifications for the confirmed applications, including Cadillac Escalade, Chevrolet Tahoe, and GMC Yukon transfer case service.