National 4072N Automatic Transmission Torque Converter Seal

Overview of National 4072N Automatic Transmission Torque Converter Seal

The National 4072N is a precision-engineered automatic transmission torque converter seal designed for reliable sealing performance. Made from durable polyacrylate material, this oil seal is compatible with a wide range of GM vehicles including Buick, Cadillac, Chevrolet, Oldsmobile, Pontiac, and Saturn models.

• Constructed from high-quality polyacrylate for durability and resistance
• Clockwise-spiral lip design (helix type) for effective sealing
• Redicoat surface treatment to enhance wear resistance
• Exact fit with inside diameter of 1.787 inches (45.390 mm) and outside diameter of 3.238 inches (82.250 mm)
• Thickness of 0.335 inches (8.510 mm) ensuring proper sealing depth
• Compatible with housing bore size of approximately 3.229 inches (82.020 mm)

Detailed Product Description and Specifications

The National 4072N automatic transmission torque converter seal is part of the 4000 series and is designed to maintain fluid integrity within the transmission system. Its polyacrylate construction offers excellent resistance to heat and transmission fluids, which helps prevent leaks and premature wear. The clockwise-spiral lip design improves sealing efficiency by directing fluid away from the shaft, reducing the risk of contamination and fluid loss. The Redicoat treatment further enhances the seal’s durability by providing a protective coating that reduces friction and wear during operation.

With precise dimensions including an inside diameter of 1.787 inches (45.390 mm) and an outside diameter of 3.238 inches (82.250 mm), this seal fits tightly within the housing bore of 3.229 inches (82.020 mm). The thickness of 0.335 inches (8.510 mm) ensures a secure fit and proper sealing depth, critical for maintaining transmission performance.

Compatible Vehicles and Applications

This torque converter seal is compatible with a broad range of General Motors vehicles, including but not limited to:

• Buick models such as Century, LeSabre, and Regal
• Cadillac models including DeVille, Eldorado, and Seville
• Chevrolet vehicles like Impala, Malibu, and Monte Carlo
• Oldsmobile models such as Cutlass and Delta 88
• Pontiac models including Grand Am, Grand Prix, and Sunfire
• Saturn models like Aura and Vue

It is suitable for use in automatic transmissions requiring an 83-type seal, ensuring proper torque converter sealing and fluid retention.

Common Issues Addressed by the National 4072N Seal

• Prevents automatic transmission fluid leaks around the torque converter
• Reduces contamination ingress that can cause transmission damage
• Minimizes wear on transmission components by maintaining proper fluid pressure
• Helps avoid costly transmission repairs due to seal failure
• Maintains optimal transmission performance and longevity

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 seal during installation
• Verify the seal orientation matches the clockwise-spiral lip design for correct fluid direction
• Check for proper fitment with the specified inside and outside diameters
• Consult vehicle service manual for torque converter removal and installation procedures

Quality Assurance and Warranty Information

The National 4072N automatic transmission torque converter seal is manufactured to meet industry standards for durability and performance. The Redicoat treatment enhances wear resistance, contributing to a longer service life. While specific warranty details may vary, National typically offers coverage against manufacturing defects to ensure customer confidence in product reliability.