National 330663 Automatic Transmission Extension Housing Seal

Overview of National 330663 Automatic Transmission Extension Housing Seal

The National 330663 automatic transmission extension housing seal is engineered to provide reliable sealing performance for Chrysler and Dodge vehicles. Designed with precision, this oil seal helps maintain transmission fluid integrity and prevents leaks in critical areas.

• Inside diameter: 1.375 inches (34.930 mm)
• Outside diameter: 1.878 inches (47.700 mm)
• Thickness/width: 0.312 inches (7.920 mm)
• Material: Durable nitrile compound for resistance to oil and heat
• Compatible with transmission housing bore of approximately 1.874 inches (47.600 mm)

Detailed Product Description and Specifications

The National 330663 seal is part of the 330000 series and is specifically designed as an automatic transmission extension housing seal. Constructed from nitrile material, it offers excellent resistance to transmission fluids and high temperatures commonly found in Chrysler and Dodge transmissions. The seal features a 1.375-inch inside diameter to fit the shaft precisely, while the 1.878-inch outside diameter ensures a secure fit within the housing bore. With a thickness of 0.312 inches, this seal maintains a tight barrier to prevent fluid leakage and contamination.

Compatible Vehicles and Applications

This transmission extension housing seal is compatible with a range of Chrysler and Dodge models, including the Chrysler 300, Dodge Dart, Imperial, Lancer, Newport, New Yorker, and Town & Country. The part number 330663 is designed to meet the specific sealing requirements of these vehicles’ automatic transmissions, ensuring proper fit and function.

Common Issues Addressed by the National 330663 Seal

• Prevents automatic transmission fluid leaks at the extension housing
• Reduces risk of contamination entering the transmission system
• Maintains proper fluid pressure for smooth transmission operation
• Helps avoid premature wear of transmission components due to fluid loss
• Ensures reliable sealing in high-temperature environments

Installation Notes and Tips

• Ensure the transmission extension housing bore is clean and free of debris before installation
• Verify the shaft diameter matches the 1.375-inch inside diameter of the seal for proper fit
• Use appropriate tools to press the seal evenly into the housing bore without damage
• Inspect the seal lip for any nicks or deformities prior to installation
• Follow vehicle manufacturer guidelines for transmission service and seal replacement

Quality Assurance and Warranty Information

National transmission seals are manufactured to meet industry standards for durability and performance. The 330663 seal undergoes rigorous quality control to ensure consistent dimensions and material integrity. While specific warranty details may vary, National typically offers coverage against manufacturing defects to provide confidence in the product’s reliability.