National 204 Manual Transmission Countershaft Bearing

Overview of National 204 Manual Transmission Countershaft Bearing

The National 204 manual transmission countershaft bearing is engineered for reliable performance in a variety of vehicle makes and models, including Chevrolet, Toyota, Nissan, and Jeep. Designed as a single row radial ball bearing, this component ensures smooth operation and durability in manual transmission systems.

• Single row radial design for efficient load handling
• Precise bore diameter of 0.787 inches (20 mm)
• Outer diameter of 1.850 inches (47 mm) for secure fitment
• Width of 0.551 inches (14 mm) suitable for countershaft applications
• Compatible with multiple vehicle makes and models including 240SX, Cherokee, and Wrangler

Technical Specifications and Design Details

The National 204 bearing features a 20 mm inner race bore with a 1.020 mm inner race radius, providing a precise fit on the countershaft. The outer race diameter measures 47 mm with a matching 1.020 mm radius, ensuring consistent contact and load distribution. With a width of 14 mm, this bearing maintains the necessary clearance and support within the transmission assembly. The ball bearing design supports radial loads typical in manual transmission countershafts, contributing to smooth gear engagement and reduced wear.

Compatible Vehicles and Applications

This manual transmission countershaft bearing is compatible with a wide range of vehicles, including but not limited to:

• Chevrolet models such as the Camaro and Pickup
• Toyota models including Corolla and T1000
• Nissan models like 240SX, 300ZX, and Frontier
• Jeep models including Cherokee, Wrangler, and Wagoneer
• Other makes such as Dodge, Chrysler, Geo, Isuzu, Pontiac, Porsche, and Suzuki

Its versatility makes it suitable for transmission repairs and rebuilds on these vehicles, ensuring proper countershaft bearing function.

Common Issues Addressed by National 204 Bearing

• Excessive transmission noise due to worn or damaged bearings
• Gear slippage or difficulty shifting caused by bearing failure
• Premature wear of transmission components from improper bearing support
• Vibration and rough operation in manual transmissions
• Overheating of transmission parts due to increased friction

Installation Notes and Tips

When installing the National 204 bearing, ensure the bore and shaft surfaces are clean and free of debris. Use appropriate tools to press the bearing into place without applying excessive force that could damage the races. Verify the bearing orientation matches the transmission design specifications. Lubricate the bearing according to manufacturer recommendations to promote longevity and smooth operation.

Quality Assurance and Warranty

National bearings are manufactured to meet industry standards for durability and precision. The 204 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, providing confidence in the product's reliability for transmission repairs.