National 411330N Differential Pinion Seal - Front Outer or Rear Outer

National 411330N Differential Pinion Seal Overview

The National 411330N differential pinion seal is engineered to provide reliable sealing performance for select Chevrolet and GMC trucks and SUVs. Designed with precision dimensions and durable polyacrylate material, this oil seal helps maintain proper lubrication and prevent leaks in driveline applications.

• Inside diameter: 2.598 inches (65.990 mm)
• Outside diameter: 3.486 inches (88.540 mm)
• Thickness/width: 0.500 inches (12.700 mm)
• Material: Polyacrylate for enhanced durability
• Redicoat surface treatment for improved wear resistance
• Compatible with Chevrolet and GMC models including C20 Suburban, K10 Suburban, C3500, and P3500

Technical Details and Specifications

The National 411330N differential pinion seal features a 2.598-inch inside diameter and a 3.486-inch outside diameter, fitting precisely into housings with a bore diameter of approximately 3.481 inches (88.420 mm). Its 0.500-inch thickness ensures a secure fit and effective sealing against oil leaks. Constructed from polyacrylate, this seal offers resistance to heat and wear, making it suitable for demanding driveline environments. The Redicoat treatment further enhances the seal’s longevity by reducing friction and wear on the sealing lip.

Compatible Vehicles and Applications

This differential pinion seal is compatible with a range of Chevrolet and GMC trucks and SUVs, including:

• Chevrolet C20 Suburban and C30
• Chevrolet C3500 and K3500 series
• GMC K10 Suburban, K20 Suburban, and K30
• GMC P30 and P3500 models

It is designed specifically for driveline and axle sealing systems, ensuring proper oil retention and protection of differential components.

Common Issues Addressed by the National 411330N Seal

• Prevents oil leaks from the differential pinion shaft
• Reduces contamination ingress into the differential housing
• Maintains lubrication integrity for differential gears
• Minimizes wear on driveline components caused by oil loss
• Helps avoid costly repairs due to seal failure

Installation Notes and Tips

When installing the National 411330N differential pinion seal, ensure the housing bore and shaft 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. Lubricate the seal lip lightly with gear oil before installation to reduce initial wear.

Quality Assurance and Warranty

National manufactures the 411330N differential pinion seal to meet industry standards for durability and performance. The polyacrylate material and Redicoat treatment contribute to a reliable service life under normal operating conditions. While specific warranty details may vary, National typically offers coverage against manufacturing defects to ensure customer confidence in the product.