National 303-SS Manual Transmission Countershaft Bearing - Rear

Overview of National 303-SS Manual Transmission Countershaft Bearing

The National 303-SS is a precision-engineered manual transmission countershaft bearing designed for reliable performance in select Audi, Chrysler, Dodge, Nissan, and Plymouth vehicles. This single row radial ball bearing ensures smooth operation and durability in demanding transmission applications.

• Single row radial design for efficient load handling
• Inner race bore diameter of 0.669 inches (17.000 mm)
• Outer race outside diameter of 1.850 inches (47.000 mm)
• Width of 0.551 inches (14.000 mm) for compact fitment
• Compatible with multiple models including Dodge Charger, Plymouth Duster, and Nissan B150

Technical Specifications and Design Features

The National 303-SS manual transmission countershaft bearing features a 300 series ball bearing with an A-3 type design. The bearing’s inner race has a precise bore of 0.669 inches (17 mm) and a width of 0.551 inches (14 mm), providing a secure fit on the countershaft. The outer race diameter measures 1.850 inches (47 mm) with a matching width of 0.551 inches (14 mm), ensuring proper alignment within the transmission housing. Both inner and outer races have a radius of 0.040 inches (1.020 mm), contributing to smooth rotation and reduced wear under radial loads.

Compatible Vehicles and Applications

This National 303-SS bearing is compatible with a range of manual transmission models from Audi, Chrysler, Dodge, Nissan, and Plymouth. Notable compatible vehicles include the Dodge Charger, Dodge Dakota, Plymouth Duster, Nissan B150, and Chrysler LeBaron. The bearing is specifically designed to replace worn or damaged countershaft bearings in these models, maintaining transmission integrity and performance.

Common Issues Addressed by the 303-SS Bearing

• Eliminates excessive play or noise in the manual transmission countershaft
• Prevents premature wear of transmission gears due to bearing failure
• Reduces vibration and improves smooth gear shifting
• Restores proper alignment of the countershaft assembly
• Mitigates risk of transmission overheating caused by bearing friction

Installation Notes and Tips

When installing the National 303-SS bearing, ensure the transmission is clean and free of debris. Use appropriate bearing press tools to avoid damage to the bearing races. Verify the bearing orientation matches the original part and confirm the bore and outer diameter dimensions for a proper fit. Lubricate the bearing according to manufacturer specifications before assembly to optimize performance and longevity.

Quality Assurance and Warranty Information

National bearings are manufactured to meet industry standards for durability and precision. The 303-SS manual transmission countershaft 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.