National 100086 Automatic Transmission Extension Housing Seal

Overview of National Automatic Transmission Extension Housing Seal 100086

The National Automatic Transmission Extension Housing Seal 100086 is engineered for reliable sealing performance in Ford and Lincoln automatic transmissions. Designed to maintain fluid integrity, this oil seal is compatible with various Ford and Lincoln models including the F-150, E-350 Econoline, and Navigator.

• Inside diameter options: 1.880 inch (47.750 mm)
• Outside diameter: 3.176 inch (80.670 mm)
• Flanged outside diameter: 3.500 inch (88.900 mm)
• Thickness: 0.480 inch (12.190 mm)
• Material: Durable fluoro-elastomer for heat and chemical resistance
• Helix type: Counter-clockwise spiral lip design for effective sealing
• Redicoat surface treatment for enhanced wear protection

Technical Details and Specifications

This National transmission extension housing seal (part number 100086) features a fluoro-elastomer construction that withstands high temperatures and exposure to transmission fluids. The seal’s counter-clockwise spiral lip design ensures a tight fit around the shaft, preventing leaks and contamination. With an inside diameter of 1.880 inches and an outside diameter of 3.176 inches, it fits precisely into the housing bore measuring 3.169 inches. The flanged outside diameter of 3.500 inches provides additional stability during installation. The overall width with side lip is 1.310 inches, accommodating the specific dimensions required for Ford and Lincoln automatic transmissions.

Compatible Vehicles and Applications

This automatic transmission extension housing seal is compatible with a range of Ford and Lincoln vehicles, including:

• Ford F-150, F-150 Heritage, F-250, F-250 Super Duty, F-350 Super Duty
• Ford E-150, E-150 Club Wagon, E-150 Econoline, E-250, E-350 Club Wagon, E-350 Econoline, E-350 Super Duty
• Ford Excursion and Expedition
• Lincoln Blackwood and Navigator

Common Issues Addressed by This Seal

• Prevents automatic transmission fluid leaks at the extension housing
• Reduces contamination ingress that can damage transmission components
• Maintains proper fluid pressure for smooth transmission operation
• Minimizes wear on the transmission shaft and housing interface
• Helps avoid costly transmission repairs due to seal failure

Installation Notes and Tips

• Ensure the housing bore and shaft are clean and free of debris before installation
• Use appropriate tools to avoid damaging the fluoro-elastomer seal during installation
• Verify the seal orientation matches the counter-clockwise spiral lip design for optimal sealing
• Check for proper fitment with the specified inside and outside diameters
• Consult vehicle service manual for torque specifications and installation procedures

Quality Assurance and Warranty

National’s transmission extension housing seal 100086 is manufactured to meet OEM standards for durability and performance. The fluoro-elastomer material and Redicoat treatment provide resistance to heat, wear, and transmission fluids. This part is part of National’s 100000 series, known for consistent quality in gaskets and sealing systems. Warranty coverage details should be confirmed with the distributor or vehicle manufacturer.