National 207-SL Manual Transmission Input Shaft Bearing

Overview of National 207-SL Manual Transmission Input Shaft Bearing

The National 207-SL is a precision-engineered manual transmission input shaft bearing designed for reliable performance in select Buick, Oldsmobile, Pontiac, and Toyota vehicles. This ball bearing supports smooth rotational movement and helps maintain transmission efficiency in models such as the Buick LeSabre, Oldsmobile 88, Pontiac Catalina, and Toyota Celica.

• Single row radial ball bearing design
• Inner race bore diameter: 1.378 inches (35.000 mm)
• Outer race outside diameter: 2.835 inches (72.000 mm)
• Width: 0.669 inches (17.000 mm)
• Inner race radius: 0.060 inches (1.524 mm)
• Series 200, Type A-11 bearing

Technical Specifications and Design Features

The National 207-SL manual transmission input shaft bearing features a single row radial design optimized for rotational stability and load distribution. The inner race bore measures 1.378 inches (35 mm), matching the input shaft diameter for a precise fit. Both the inner and outer races have a width of 0.669 inches (17 mm), ensuring consistent bearing support across the shaft. The outer race outside diameter is 2.835 inches (72 mm), providing a robust housing interface. The inner race radius of 0.060 inches (1.524 mm) contributes to smooth ball movement and reduced friction during operation.

Compatible Vehicles and Applications

This bearing is compatible with manual transmissions in various Buick, Oldsmobile, Pontiac, and Toyota models, including:

• Buick LeSabre and Century
• Oldsmobile 88 and 98
• Pontiac Catalina, Skylark, Starfire, and Tempest
• Toyota Celica, Corona, and Pickup

Use the National 207-SL bearing to address issues related to input shaft wear, noise, or transmission roughness in these vehicles.

Common Issues Addressed by the 207-SL Bearing

• Excessive input shaft play causing gear misalignment
• Noise or vibration originating from worn transmission bearings
• Reduced transmission efficiency due to bearing wear
• Premature wear of transmission components from improper shaft support
• Overheating or friction-related damage within the input shaft assembly

Installation Notes and Tips

Ensure the transmission input shaft and housing are clean and free of debris before installing the National 207-SL bearing. Proper alignment during installation is critical to prevent premature wear. Use appropriate tools to press the bearing into place without damaging the races or balls. Verify fitment compatibility with your specific vehicle model and transmission type prior to installation.

Quality Assurance and Warranty

National bearings are manufactured to meet industry standards for durability and precision. The 207-SL bearing undergoes rigorous quality control to ensure consistent performance in manual transmission applications. While specific warranty details are not provided, National products typically adhere to manufacturer guidelines for reliability and service life.