National HM89443 Differential Pinion Bearing - Rear Inner or Rear Outer

National HM89443 Differential Pinion Bearing Overview

The National HM89443 differential pinion bearing is engineered for reliable driveline performance in select Chrysler, Dodge, Ford, Lincoln, and Mercury vehicles. Designed as a taper bearing cone, this part ensures precise fitment and durability for models including the Ford F-150, Dodge Dart, and Lincoln Navigator.

• Part Number: HM89443
• Brand: National
• Category: Driveline and Axles > Bearings
• Cone Bore Diameter: 1.3125 inches (33.3380 mm)
• Cone Length: 1.1250 inches (28.5750 mm)
• Cone Radius: 0.0250 inches (0.6350 mm)
• Part Description: Taper bearing cone

Technical Specifications and Attributes

This differential pinion bearing features a cone bore measuring 1.3125 inches (33.3380 mm), providing a precise fit for the pinion shaft. The cone length of 1.1250 inches (28.5750 mm) supports proper bearing seating and load distribution. Additionally, the cone radius of 0.0250 inches (0.6350 mm) is designed to optimize contact surfaces, reducing wear and enhancing bearing life. These dimensions are critical for maintaining differential performance and driveline stability in compatible vehicles.

Compatible Vehicles and Applications

The National HM89443 bearing is compatible with a range of vehicles from Chrysler, Dodge, Ford, Lincoln, and Mercury. Notable models include the Ford F-150, F-250 Super Duty, Mustang, Lincoln Navigator, Dodge Dart, and Mercury Villager. This part is suitable for applications requiring a differential pinion bearing cone with the specified dimensions, ensuring proper fit and function in these driveline systems.

Common Issues Addressed by HM89443 Bearing

• Eliminates excessive pinion shaft play and noise
• Prevents premature bearing wear and failure
• Reduces differential gear misalignment
• Improves driveline smoothness and stability
• Supports proper load distribution within the differential

Installation Notes and Tips

When installing the National HM89443 differential pinion bearing, ensure the bearing cone bore matches the pinion shaft diameter precisely. Proper cleaning and lubrication of the bearing and surrounding components are essential to prevent premature wear. Use appropriate tools to seat the bearing cone without causing damage to the cone radius or bore. Verify correct preload settings during assembly to maintain optimal bearing performance.

Quality Assurance and Warranty

National bearings are manufactured to meet industry standards for durability and precision. The HM89443 differential pinion bearing undergoes rigorous quality control to ensure dimensional accuracy and material integrity. While specific warranty details may vary, National typically offers coverage against manufacturing defects, providing confidence in the part's reliability for your Chrysler, Dodge, Ford, Lincoln, or Mercury vehicle.