National 714503 Transfer Case Output Shaft Seal - Front or Rear

Overview of National Transfer Case Output Shaft Seal 714503

The National Transfer Case Output Shaft Seal 714503 is engineered to provide reliable sealing performance for transfer cases in select Chevrolet, Ford, GMC, Land Rover, Lincoln, and Oldsmobile vehicles. Designed with precision dimensions and durable polyacrylate material, this oil seal helps maintain optimal transfer case function by preventing fluid leaks.

• Inside diameter: 1.886 inches (47.900 mm)
• Outside diameter: 2.765 inches (70.230 mm)
• Flanged outside diameter: 3.150 inches (80.000 mm)
• Thickness: 0.472 inches (12.000 mm)
• Overall width with side lip: 0.837 inches (21.250 mm)
• Sealing material: Polyacrylate for enhanced durability
• Compatible with transfer case housing bore of 2.756 inches (69.850 mm)

Detailed Product Description and Specifications

The National 714503 transfer case output shaft seal is part of the 714000 series, designed specifically to fit transfer cases requiring a Type 87 oil seal. Constructed from polyacrylate, this seal offers resistance to heat and wear, ensuring a tight seal around the output shaft with a diameter of 1.886 inches (47.900 mm). The flanged outside diameter of 3.150 inches (80.000 mm) and overall width with side lip of 0.837 inches (21.250 mm) provide a secure fit within the transfer case housing bore of 2.756 inches (69.850 mm). This precise fit helps prevent oil leakage and contamination, maintaining transfer case integrity and performance.

Compatible Vehicles and Applications

This transfer case output shaft seal is compatible with a range of vehicles including Chevrolet Astro and Bravada, Ford Bronco, Expedition, F-150, F-250, F-250 HD, F-350, GMC K3500, Land Rover Range Rover and Safari, Lincoln Navigator, and Oldsmobile models. The part number 714503 ensures correct fitment for these specific makes and models, supporting transfer case maintenance and repair.

Common Issues Addressed by the Transfer Case Output Shaft Seal

• Prevents transfer case fluid leaks that can lead to low fluid levels
• Reduces contamination ingress that can cause premature transfer case wear
• Maintains proper lubrication of the output shaft and internal components
• Helps avoid transfer case overheating due to fluid loss
• Supports smooth drivetrain operation by preserving seal integrity

Installation Notes and Tips

• Ensure the transfer case housing bore is clean and free of debris before installation
• Use appropriate tools to avoid damaging the polyacrylate seal during installation
• Verify the seal orientation matches the original part to maintain proper sealing
• Check shaft and bore dimensions to confirm compatibility with the 714503 seal
• Apply a light coating of transfer case fluid to the seal lip before installation for easier fitment

Quality Assurance and Warranty Information

National transfer case output shaft seals are manufactured to meet industry standards for durability and performance. The polyacrylate material provides resistance to heat and wear, contributing to long service life. While specific warranty details for part number 714503 may vary, National typically offers coverage against manufacturing defects to ensure customer confidence in product reliability.