National 410308 Automatic Transmission Extension Housing Seal - Front or Rear Outer

Overview of National 410308 Automatic Transmission Extension Housing Seal

The National 410308 automatic transmission extension housing seal is designed for reliable sealing performance in Ford Bronco, F-100, F-150, F-250, and F-350 models. Manufactured from durable nitrile material, this oil seal ensures effective protection against fluid leaks in your vehicle's transmission system.

• Inside diameter: 2.125 inches (53.98 mm)
• Outside diameter: 3.066 inches (77.88 mm)
• Thickness/width: 0.500 inches (12.7 mm)
• Sealing material: Nitrile for resistance to oil and heat
• Redicoat finish for enhanced durability
• Zero duplication part ensuring precise fit and quality

Detailed Product Description

The National 410308 transmission extension housing seal is engineered to maintain a secure seal between the transmission extension housing and the shaft. Its nitrile construction offers excellent resistance to transmission fluids, heat, and wear, making it suitable for demanding automotive environments. The seal’s dimensions, including a 2.125-inch inside diameter and a 3.066-inch outside diameter, are optimized for compatibility with specific Ford models such as the Bronco and F-Series trucks. The Redicoat finish adds an extra layer of protection against corrosion and extends the service life of the seal.

Applications and Common Issues Addressed

• Prevents transmission fluid leaks from the extension housing
• Reduces contamination ingress into the transmission system
• Helps maintain proper hydraulic pressure within the transmission
• Minimizes wear on the transmission shaft and housing interface
• Addresses seal failure symptoms such as fluid seepage and transmission slipping

Installation Notes and Tips

• Ensure the housing bore (3.061 inches) and shaft (2.125 inches) are clean and free of debris before installation
• Use appropriate tools to avoid damaging the nitrile seal during installation
• Apply a light coating of transmission fluid to the seal lip to facilitate proper seating
• Verify correct orientation of the seal to prevent leaks
• Inspect the transmission extension housing for wear or damage prior to seal replacement

Quality Assurance and Warranty

National transmission seals, including part number 410308, are manufactured to meet strict industry standards for durability and performance. The use of nitrile material and Redicoat finish ensures resistance to oil, heat, and corrosion. This part is a zero duplication item, guaranteeing precise fitment for Ford Bronco and F-Series trucks. While specific warranty details may vary, National products typically come with a limited warranty against manufacturing defects to provide confidence in your purchase.