National 6879H Manual Transmission Output Shaft Seal - Front

Overview of National 6879H Manual Transmission Output Shaft Seal

The National 6879H manual transmission output shaft seal is engineered to provide reliable sealing performance for select Chrysler and Dodge vehicles. Designed with durable silicone material, this oil seal helps maintain transmission integrity by preventing fluid leaks and contamination.

• Inside diameter: 2.125 inches (53.980 mm)
• Outside diameter: 2.879 inches (73.130 mm)
• Thickness/width: 0.375 inches (9.530 mm)
• Sealing material: Silicone for enhanced durability and flexibility
• Housing bore size: 2.875 inches (73.030 mm)
• Part type: Manual transmission output shaft seal
• Series: 6000

Detailed Product Description

The National 6879H output shaft seal is specifically designed to fit manual transmissions in Chrysler and Dodge models such as the 300, Dart, Imperial, Lancer, Newport, New Yorker, and Town & Country. Constructed from high-quality silicone, this seal offers excellent resistance to heat, oil, and wear, ensuring a tight seal around the transmission output shaft. The precise dimensions, including a 2.125-inch inside diameter and 2.879-inch outside diameter, allow for a secure fit within the housing bore of 2.875 inches. The 0.375-inch thickness provides adequate sealing surface to prevent leaks and protect transmission components from dirt and debris.

Common Applications and Problem Solving

• Prevents manual transmission fluid leaks in Chrysler and Dodge vehicles
• Reduces risk of contamination entering the transmission system
• Helps maintain proper lubrication of the output shaft
• Addresses wear-related seal failures in older transmissions
• Supports smooth transmission operation by maintaining seal integrity

Installation Notes and Tips

• Ensure the transmission output shaft and housing bore are clean and free of debris before installation
• Use appropriate tools to avoid damaging the silicone seal during installation
• Verify the seal orientation matches the original part for proper sealing function
• Check for any signs of wear or damage on the shaft that could affect seal performance
• Consult vehicle service manual for torque specifications and installation procedures

Quality Assurance and Warranty

National manufactures the 6879H output shaft seal to meet industry standards for durability and performance. The silicone material is selected for its resistance to heat and oil degradation, contributing to a longer service life. While specific warranty details may vary, National products typically come with a limited warranty against manufacturing defects, providing confidence in the part's reliability for Chrysler and Dodge manual transmission applications.