National 710956 Transfer Case Input Shaft Seal

Overview of National Transfer Case Input Shaft Seal 710956

The National 710956 transfer case input shaft seal is engineered to provide reliable sealing performance for select Lexus and Toyota models. Designed with precision dimensions and durable ethylene-acrylic material, this oil seal helps maintain transfer case integrity and prevent fluid leaks.

• Compatible with Lexus Land Cruiser, LX570 and Toyota Sequoia, Tundra transfer cases
• Inside diameter: 1.969 inches (50 mm) to fit 40-type shafts
• Outside diameter: 2.803 inches (71.2 mm) for secure housing bore fit
• Thickness: 0.394 inches (10 mm) with overall width including side lip of 0.689 inches (17.5 mm)
• Clockwise-spiral lip design for effective sealing and reduced wear
• Constructed from ethylene-acrylic sealing material for durability and resistance to oil degradation

Detailed Product Description and Specifications

The National 710956 transfer case input shaft seal is part of the 710900 series, designed specifically for transfer case applications requiring a 40-type shaft seal. Its inside diameter of 1.969 inches (50 mm) matches the shaft size of compatible Lexus and Toyota transfer cases, ensuring a precise fit. The outside diameter of 2.803 inches (71.2 mm) corresponds closely with the housing bore dimensions, measured at 2.795 inches (71 mm), to provide a tight seal that prevents oil leakage.

The seal features a clockwise-spiral lip design, which enhances sealing efficiency by directing fluid away from the shaft and reducing the risk of contamination ingress. Made from ethylene-acrylic material, the seal offers resistance to heat, oil, and wear, contributing to longer service life under demanding operating conditions.

Applications and Common Issues Addressed

• Prevents transfer case oil leaks in Lexus Land Cruiser and LX570 models
• Maintains proper lubrication in Toyota Sequoia and Tundra transfer cases
• Reduces risk of transfer case input shaft seal failure due to wear or damage
• Helps avoid contamination and debris ingress that can cause transfer case damage
• Supports smooth transfer case operation by maintaining fluid integrity

Installation Notes and Tips

Ensure the transfer case housing bore is clean and free of debris before installing the National 710956 seal. Use appropriate tools to press the seal evenly into the bore without distortion. Verify the seal’s orientation matches the clockwise-spiral lip design for optimal sealing performance. Avoid using excessive force during installation to prevent damage to the ethylene-acrylic material.

Quality Assurance and Warranty Information

National transfer case input shaft seals are manufactured to meet industry standards for durability and performance. The 710956 seal undergoes quality control inspections to ensure dimensional accuracy and material integrity. While specific warranty details are not provided, National products typically adhere to OEM-equivalent quality requirements for reliable service in Lexus and Toyota transfer case applications.