National 410085 Manual Transmission Output Shaft Seal

Overview of National Manual Transmission Output Shaft Seal 410085

The National 410085 manual transmission output shaft seal is engineered to provide reliable sealing performance for select Chevrolet and GMC trucks and SUVs. Constructed from durable nitrile material, this oil seal is designed to maintain transmission fluid integrity and prevent leaks in demanding driving conditions.

• High-quality nitrile construction for resistance to oil and wear
• Inside diameter of 2.000 inches (50.8 mm) to fit output shafts precisely
• Outside diameter of 3.001 inches (76.23 mm) for secure housing bore fitment
• Thickness of 0.500 inches (12.7 mm) ensuring proper sealing depth
• Redicoat surface treatment for enhanced durability and corrosion resistance
• Compatible with a wide range of Chevrolet and GMC models including Blazer, C10, K5 Blazer, and Suburban variants

Detailed Product Description and Specifications

The National 410085 output shaft seal is part of the 410000 series, designed specifically for manual transmissions requiring a 2.000 inch (50.8 mm) shaft diameter. The seal’s nitrile rubber material offers excellent resistance to petroleum-based fluids and high temperatures commonly found in transmission environments. With an outside diameter of 3.001 inches (76.23 mm) and a housing bore size of approximately 2.996 inches (76.1 mm), this seal fits securely to prevent fluid leakage. The 0.500 inch (12.7 mm) thickness provides a robust sealing surface, while the Redicoat treatment enhances the seal’s longevity by protecting against corrosion and wear. This part number 410085 is engineered to meet the specifications required for manual transmission output shafts on various Chevrolet and GMC trucks and SUVs, ensuring compatibility and reliable performance.

Compatible Vehicles and Applications

• Chevrolet Blazer, C10, C20, C30, and Suburban models
• GMC Jimmy, K5 Blazer, K10, K20, K30, and Suburban variants
• Chevrolet and GMC pickup trucks including C1500, C2500, C3500, and their Suburban versions
• G-series vans such as G10, G20, and G30
• Heavy-duty models like P10, P20, P30, and their respective Suburban and V-series trucks

Common Issues Addressed by the National 410085 Seal

• Prevents manual transmission fluid leaks from the output shaft area
• Reduces contamination of transmission internals by dirt and debris
• Maintains proper lubrication to extend transmission component life
• Helps avoid costly transmission repairs due to seal failure
• Ensures consistent transmission performance under various operating conditions

Installation Notes and Tips

When installing the National 410085 output shaft seal, ensure the transmission output shaft and housing bore are clean and free of debris. Use appropriate tools to press the seal evenly into the housing bore without damaging the sealing lip. Verify the seal orientation matches the original part to maintain proper sealing function. It is recommended to inspect the shaft surface for wear or damage before installation to prevent premature seal failure.

Quality Assurance and Warranty Information

National manufactures the 410085 output shaft seal to meet industry standards for durability and performance. The nitrile material and Redicoat treatment contribute to the seal’s resistance to oil degradation and corrosion. While specific warranty details are not provided, National products typically adhere to quality control processes to ensure reliable fitment and function for Chevrolet and GMC manual transmission applications.