National 4529N Manual Transmission Input Shaft Seal

Overview of National 4529N Manual Transmission Input Shaft Seal

The National 4529N manual transmission input shaft seal is engineered to provide reliable sealing performance for a range of Chevrolet, Dodge, GMC, Isuzu, and Jeep vehicles. Designed with durable polyacrylate material and a clockwise-spiral lip design, this oil seal helps maintain transmission integrity by preventing fluid leaks.

• Constructed from high-quality polyacrylate for durability and resistance
• Clockwise-spiral lip design for effective sealing on manual transmission input shafts
• Inside diameter of 1.375 inches (34.930 mm) to fit specified shafts
• Outside diameter of 2.052 inches (52.120 mm) matching housing bore dimensions
• Thickness of 0.330 inches (8.380 mm) for proper fit and sealing
• Redicoat feature for enhanced corrosion resistance
• Part of the National 4000 series, ensuring consistent quality standards

Detailed Product Description and Specifications

The National 4529N is a manual transmission input shaft seal designed to fit shafts with an inside diameter of 1.375 inches (34.930 mm) and housings with a bore diameter of approximately 2.047 inches (52.000 mm). Its polyacrylate construction offers chemical resistance and durability under typical transmission operating conditions. The clockwise-spiral lip design improves sealing efficiency by directing fluid back into the transmission, reducing the risk of leaks. The seal thickness of 0.330 inches (8.380 mm) ensures a secure fit within the housing bore, while the redicoat coating provides additional protection against corrosion and wear. This seal is compatible with a variety of manual transmission applications in Chevrolet Blazer, C1500, C2500, C3500, GMC Sierra 1500, Sierra 1500 Classic, and Silverado 1500 Classic, as well as Dodge Ram 1500, Ram 2500, Dakota, and Jeep Wrangler models.

Applications and Common Issues Addressed

• Prevents manual transmission fluid leaks on input shafts
• Reduces contamination from dirt and debris entering the transmission
• Helps maintain proper lubrication for transmission components
• Addresses wear-related seal failures in Chevrolet, Dodge, GMC, Isuzu, and Jeep vehicles
• Mitigates issues caused by shaft misalignment or seal degradation over time

Installation Notes and Tips

• Ensure the shaft and housing bore are clean and free of debris before installation
• Use appropriate tools to press the seal evenly into the housing bore without distortion
• Verify the seal’s orientation matches the clockwise-spiral lip design for optimal sealing
• Inspect the shaft for wear or damage that could affect seal performance
• Apply a light coating of transmission fluid to the seal lip before installation to reduce initial wear

Quality Assurance and Warranty Information

The National 4529N manual transmission input shaft seal is manufactured to meet industry standards for durability and performance. As part of the National 4000 series, it undergoes rigorous quality control to ensure consistent dimensions and material integrity. This product includes a limited warranty against manufacturing defects, providing confidence in its reliability for compatible Chevrolet, Dodge, GMC, Isuzu, and Jeep models.