Timken SP620303 Wheel Bearing and Hub Assembly - Front

Timken SP620303 Wheel Bearing and Hub Assembly Overview

The Timken SP620303 wheel bearing and hub assembly is engineered for reliable performance in heavy-duty Chevrolet and GMC trucks. Designed specifically for models like the Sierra 2500 HD, Sierra 3500 HD, Silverado 2500 HD, and Silverado 3500 HD, this assembly ensures precise fitment and durability under demanding conditions.

• 36 spline quantity for secure axle engagement
• 8 wheel studs for robust wheel mounting
• 4 flange bolt holes for stable attachment
• Wheel pilot diameter of 123.99 mm (4.881 inches) for accurate wheel centering
• Brake pilot diameter of 126.95 mm (4.998 inches) to support brake component alignment
• Hub pilot diameter of 114.04 mm (4.490 inches) for proper hub positioning
• Flange offset of 2.927 mm (74.35 inches) and flange diameter of 221.30 mm (8.713 inches)
• Bolt circle diameter of 180.00 mm (7.087 inches) matching OEM specifications
• Designed for driven axle applications

Detailed Product Description

The Timken SP620303 is a wheel bearing and hub assembly tailored for driven axles on select Chevrolet and GMC heavy-duty trucks. Its 36-spline design ensures a secure connection to the axle shaft, while the 8-wheel stud configuration provides a stable mounting surface for wheels. The precise wheel pilot diameter of 123.99 mm (4.881 inches) and brake pilot diameter of 126.95 mm (4.998 inches) facilitate proper alignment of wheels and brake components, reducing vibration and wear. The hub pilot diameter of 114.04 mm (4.490 inches) guarantees accurate hub placement, critical for maintaining vehicle stability and handling. Flange offset and diameter measurements conform to factory specifications, ensuring compatibility with OEM parts and maintaining proper wheel positioning.

Compatible Vehicles and Applications

This Timken wheel bearing and hub assembly is compatible with the following models:

• Chevrolet Sierra 2500 HD
• Chevrolet Sierra 3500 HD
• GMC Sierra 2500 HD
• GMC Sierra 3500 HD
• Chevrolet Silverado 2500 HD
• Chevrolet Silverado 3500 HD

Common Issues Addressed by This Assembly

• Eliminates wheel bearing noise caused by wear or damage
• Resolves wheel wobble and vibration issues
• Prevents premature brake component misalignment
• Corrects hub misalignment affecting steering and handling
• Restores secure wheel mounting to prevent lug nut loosening

Installation Notes and Tips

Proper installation of the Timken SP620303 requires attention to torque specifications for flange bolts and wheel studs. Ensure the hub pilot and wheel pilot diameters align correctly with the vehicle’s components to avoid premature wear. It is recommended to inspect axle splines for damage before installation and to use appropriate tools to avoid contamination of the bearing surfaces. Professional installation is advised to maintain vehicle safety and performance.

Quality Assurance and Warranty

Timken manufactures the SP620303 wheel bearing and hub assembly to meet or exceed OEM standards for durability and performance. The product undergoes rigorous quality control testing to ensure reliability in heavy-duty applications. Warranty coverage details should be confirmed with the supplier or manufacturer, as Timken typically offers limited warranties covering defects in materials and workmanship.