National 472635 Transfer Case Output Shaft Seal - Front or Rear

Overview of National Transfer Case Output Shaft Seal 472635

The National Transfer Case Output Shaft Seal 472635 is engineered to provide reliable sealing performance for transfer cases in select Chevrolet, GMC, and Jeep vehicles. Designed with durable nitrile material and precise dimensions, this oil seal helps maintain optimal transfer case function by preventing fluid leaks.

• Inside diameter: 1.552 inches (39.420 mm)
• Outside diameter: 2.506 inches (63.650 mm)
• Thickness/width: 0.500 inches (12.700 mm)
• Sealing material: Nitrile for resistance to oil and heat
• Redicoat surface treatment for enhanced durability
• Compatible with Chevrolet Blazer, GMC Jimmy, Jeep CJ5, and K10/K20 Suburban models

Detailed Product Description and Specifications

This National transfer case output shaft seal, part number 472635, is manufactured from nitrile, a synthetic rubber known for its excellent resistance to petroleum-based fluids and high temperatures. The seal features an inside diameter of 1.552 inches (39.420 mm) and an outside diameter of 2.506 inches (63.650 mm), with a thickness of 0.500 inches (12.700 mm). These precise measurements ensure a proper fit within the housing bore, which measures approximately 2.502 inches (63.550 mm). The Redicoat coating enhances the seal’s surface, improving wear resistance and extending service life. This seal is part of National’s 470000 series, designed specifically for transfer case applications requiring reliable oil retention and protection against contaminants.

Compatible Vehicles and Applications

This transfer case output shaft seal is compatible with a range of Chevrolet, GMC, and Jeep models, including:

• Chevrolet Blazer
• GMC Jimmy
• Jeep CJ5
• Chevrolet K10 Suburban
• Chevrolet K20 Suburban

It is designed to replace worn or damaged seals in these vehicles’ transfer cases, helping to maintain proper lubrication and prevent fluid leaks.

Common Issues Addressed by This Seal

• Prevents transfer case fluid leaks that can lead to low fluid levels
• Reduces contamination ingress that can cause premature wear
• Maintains proper lubrication of the output shaft
• Helps avoid transfer case overheating due to fluid loss
• Eliminates noise and vibration caused by 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 seal during installation
• Verify the seal orientation matches the original part for proper sealing
• Lubricate the seal lip with transfer case fluid prior to installation
• Check for proper fit and alignment to prevent premature failure

Quality Assurance and Warranty

National manufactures this transfer case output shaft seal to meet industry standards for durability and performance. The use of nitrile material and Redicoat treatment ensures resistance to oil, heat, and wear. While specific warranty details may vary, National typically offers coverage against manufacturing defects to provide confidence in the product’s reliability.