National 306 Transfer Case Output Shaft Bearing

National 306 Transfer Case Output Shaft Bearing

The National 306 is a transfer case output shaft bearing built to OE-quality standards for dependable drivetrain support. It uses a single row radial ball bearing design with a 30.000 mm bore and 72.000 mm outside diameter for precise fitment in a wide range of transfer case and transmission applications.

Compatible With Ford Explorer, Mercury Mountaineer, Isuzu Rodeo, Nissan Pathfinder, Mazda Miata, and other listed applications, this bearing is engineered for consistent rotation and long service life. The National 306 part number is also a direct reference point for many OE and aftermarket cross-references.

Key Features

• Transfer case output shaft bearing for drivetrain service
• Single row radial ball bearing design
• 30.000 mm bore and 72.000 mm outside diameter
• 19.000 mm width for application-specific fitment
• Manufactured to exacting standards for lasting performance
• OE-quality replacement from National

Detailed Description

National 306 is a ball bearing in the 300 series, Type A-1, with a 1.181 inch bore, 2.835 inch outside diameter, and 0.748 inch width. The bearing dimensions are matched for transfer case output shaft service where accurate support and smooth operation are required. This part is used across many 4WD transfer case applications, including Borg-Warner, Fuji Univance, Mitsubishi, and Isuzu setups, as well as select manual transmission applications.

This part cross-references Timken 306TB and SKF 6306-J for the same application. National 306 is a practical replacement choice when servicing driveline noise, shaft support, or bearing wear in vehicles such as Ford Explorer and Mazda Miata applications listed below.

What This Bearing Is Used For

• Transfer case output shaft noise
• Excessive shaft play or looseness
• Rough bearing rotation during drivetrain service
• Wear in 4WD transfer case support points
• Restoring smooth operation in select transmission and transfer case assemblies

Installation Notes and Tips

Verify bore, outside diameter, and width before installation. Confirm the transfer case or transmission code listed in the fitment notes, since several vehicles use different assemblies across model years. Clean the bearing seat and inspect the shaft for scoring or heat damage before pressing in the new bearing. Proper alignment during installation helps prevent premature wear.

Fits 2006-2015 Mazda MX-5 Miata, N/A with Mazda M15M-D Transmission. Fits 2006-2010 Ford Explorer, Rear with Borg-Warner 4412E Transfer Case; with Part Time 4WD; 2 Speed. Fits 2006-2010 Ford Explorer, Front Inner with Borg-Warner 4412E Transfer Case; with Part Time 4WD; 2 Speed. Fits 2007-2010 Ford Explorer Sport Trac, Rear with Borg-Warner 4412E Transfer Case; with Part Time 4WD; 2 Speed. Fits 2007-2010 Ford Explorer Sport Trac, Front Inner with Borg-Warner 4412E Transfer Case; with Part Time 4WD; 2 Speed. Fits 2006-2010 Mercury Mountaineer, Rear with Borg-Warner 4412E Transfer Case; with Part Time 4WD; 2 Speed. Fits 2006-2010 Mercury Mountaineer, Front Inner with Borg-Warner 4412E Transfer Case; with Part Time 4WD; 2 Speed. Fits 2003-2009 Kia Sorento, Rear Full Time 4WD; with Borg-Warner 4424 Transfer Case; 2 Speed. Fits 2003-2006 Hyundai Santa Fe, Rear Full Time 4WD; with Borg-Warner 4424 Transfer Case; 2 Speed. Fits 2002-2005 Ford Explorer, Front Inner and Rear with Borg-Warner 4411E Transfer Case; with Part Time 4WD; 2 Speed. Fits 2005 Lincoln Aviator, Rear and Front Inner with Borg-Warner 4411E Transfer Case; with Part Time 4WD; 2 Speed. Fits 1999-2005 Mazda Miata, N/A with Mazda M15M-D Transmission. Fits 1994-1997 Mazda Miata, N/A with Mazda M15M-D Transmission.

Quality Assurance

National manufactures this bearing to meet or exceed OE quality standards, with premium construction intended for extended bearing life and dependable performance in drivetrain service.