National HM903249 Differential Pinion Bearing - Rear or Rear Inner

Overview of National HM903249 Differential Pinion Bearing

The National HM903249 differential pinion bearing is engineered for reliable driveline performance in select heavy-duty and luxury vehicles. Designed to meet precise specifications, this taper bearing cone supports smooth differential operation in models from Chevrolet, Dodge, GMC, Ram, Bentley, and Rolls-Royce.

• Compatible with Chevrolet Silverado 2500 HD, GMC Sierra 2500 HD, Ram 1500, and Bentley Continental
• Part number HM903249 ensures exact fitment and quality
• Cone bore diameter of 1.7500 inches (44.45 mm) for accurate seating
• Cone length of 1.1250 inches (28.575 mm) for optimal bearing engagement
• Cone radius of 0.1400 inches (3.556 mm) designed for tapered bearing cone applications

Technical Specifications and Design Details

This National differential pinion bearing features a taper bearing cone design, critical for supporting the pinion gear within the differential assembly. The cone bore measures 1.7500 inches (44.45 mm), providing a precise fit on the pinion shaft. With a cone length of 1.1250 inches (28.575 mm), the bearing ensures proper load distribution and durability under heavy torque conditions. The cone radius of 0.1400 inches (3.556 mm) is engineered to maintain correct bearing geometry and reduce wear.

Compatible Vehicles and Applications

The HM903249 bearing is compatible with a range of vehicles including Chevrolet Silverado 2500 HD, GMC Sierra 2500 HD Classic, Ram 1500, and luxury models such as Bentley Continental and Rolls-Royce Silver Shadow II. This part is suitable for driveline and axle repairs requiring a differential pinion bearing replacement in these specific makes and models.

• Supports differential pinion gear rotation and alignment
• Addresses issues like bearing noise and excessive play
• Prevents premature wear of differential components
• Helps maintain proper gear mesh and drivetrain efficiency

Installation Notes and Tips

Proper installation of the National HM903249 bearing requires careful cleaning of the pinion shaft and differential housing. Use appropriate tools to press the bearing cone onto the pinion shaft without damaging the bearing surfaces. Verify bearing preload and backlash settings according to the vehicle manufacturer’s specifications to ensure optimal performance and longevity.

Quality Assurance and Warranty

National bearings are manufactured to meet industry standards for durability and precision. The HM903249 differential pinion bearing undergoes rigorous quality control to ensure consistent performance. While specific warranty details may vary, National typically offers coverage against manufacturing defects to provide confidence in the product’s reliability.