National 4989 Wheel Seal - Rear Inner

Overview of National 4989 Wheel Seal for Dodge and Mitsubishi

The National 4989 wheel seal is engineered to provide reliable sealing performance for select Dodge and Mitsubishi vehicles. Designed with precision, this oil seal helps maintain driveline integrity by preventing lubricant leaks and contamination.

• Inside diameter: 1.457 inches (37.000 mm)
• Outside diameter: 2.451 inches (62.260 mm)
• Housing bore diameter: 2.441 inches (62.000 mm)
• Width: 0.551 inches (14.000 mm)
• Material: durable nitrile rubber for resistance to oil and wear
• Part number: 4989, part of the National 4000 series

Technical Details and Material Specifications

This wheel seal from National is constructed from nitrile, a synthetic rubber known for its excellent resistance to petroleum-based oils and high temperatures. The seal’s dimensions—1.457 inch inside diameter and 2.451 inch outside diameter—are designed to fit shafts and housings precisely, ensuring a tight seal. The 0.551 inch width provides adequate surface area to prevent leakage while maintaining durability under typical driveline stresses. The 4989 seal belongs to the National 4000 series, which focuses on reliable sealing solutions for automotive driveline and axle applications.

Compatible Vehicles and Applications

This wheel seal is compatible with various Dodge and Mitsubishi models, including the Dodge D50, Power Ram 50, Ram 50, and Mitsubishi Mighty Max, Montero, Montero Sport, and Raider. It is specifically designed to fit the shaft and housing bore dimensions of these vehicles, making it suitable for use in their driveline and axle assemblies.

• Prevents oil leaks in wheel hubs and axle assemblies
• Protects bearings from dirt and moisture contamination
• Maintains proper lubrication for driveline components
• Reduces wear and extends component life
• Helps avoid costly repairs due to seal failure

Installation Notes and Tips

When installing the National 4989 wheel seal, ensure the shaft and housing bore are clean and free of debris. Use appropriate tools to press the seal evenly into the housing bore without damaging the sealing lip. Lubricate the seal lip lightly with compatible oil before installation to reduce initial wear. Verify the seal is seated flush and properly aligned to prevent premature failure.

Quality Assurance and Warranty Information

National wheel seals, including part number 4989, are manufactured to meet industry standards for durability and performance. The nitrile material and precise dimensions ensure consistent sealing under normal operating conditions. While specific warranty details may vary, National typically offers coverage against manufacturing defects. Consult product documentation or the vehicle service manual for detailed warranty and replacement guidelines.