National 710904 Manual Transmission Input Shaft Seal

Overview of National 710904 Manual Transmission Input Shaft Seal

The National 710904 manual transmission input shaft seal is engineered for reliable sealing performance in Dodge Ram 2500 and Ram 3500 models. Designed to maintain transmission fluid integrity, this oil seal helps prevent leaks and protects your manual transmission system.

• Inside diameter: 1.567 inches (39.8 mm)
• Outside diameter: 2.449 inches (62.2 mm)
• Thickness/width: 0.315 inches (8.0 mm)
• Material: durable fluoro-elastomer for enhanced chemical and temperature resistance
• Clockwise-spiral helix lip design for effective sealing
• Housing bore diameter: 2.441 inches (62.0 mm)
• Part number: 710904, part of the 710900 series

Detailed Product Description

This National manual transmission input shaft seal (part number 710904) is specifically designed to fit Dodge Ram 2500 and Ram 3500 trucks. The seal features a fluoro-elastomer construction, which offers excellent resistance to heat, oil, and other transmission fluids, ensuring long-lasting durability. Its clockwise-spiral lip design improves sealing efficiency by directing fluid back into the transmission housing, reducing the risk of leaks around the input shaft.

With precise dimensions including a 1.567-inch inside diameter and a 2.449-inch outside diameter, this seal fits securely within the transmission housing bore of 2.441 inches. The 0.315-inch thickness provides a robust barrier against fluid escape while accommodating shaft movement.

Applications and Common Issues Addressed

• Prevents transmission fluid leaks in manual transmissions of Dodge Ram 2500 and Ram 3500
• Protects input shaft bearings from contamination by dirt and debris
• Reduces risk of premature transmission wear due to fluid loss
• Helps maintain proper lubrication and transmission performance
• Addresses common seal failures caused by heat and chemical degradation

Installation Notes and Tips

• Ensure the transmission housing bore is clean and free of debris before installation
• Use appropriate tools to press the seal evenly into place without distortion
• Verify the seal’s orientation matches the clockwise-spiral lip design for optimal sealing
• Inspect the input shaft for wear or damage prior to installing the new seal
• Follow vehicle manufacturer torque specifications when reassembling transmission components

Quality Assurance and Warranty

National’s 710904 input shaft seal is manufactured to meet industry standards for durability and performance. The fluoro-elastomer material and precision engineering ensure consistent sealing under demanding conditions. This part is backed by National’s quality control processes, providing confidence in fitment and function for Dodge Ram 2500 and Ram 3500 manual transmissions.