National 40576S Drive Axle Shaft Seal - Front

National 40576S Drive Axle Shaft Seal Overview

The National 40576S drive axle shaft seal is engineered to provide reliable sealing performance for Jeep CJ5 and Wagoneer models. Constructed from durable nitrile material, this oil seal is designed to maintain axle integrity and prevent fluid leaks under demanding conditions.

• Material: High-quality nitrile for resistance to oil and wear
• Inside Diameter: 1.187 inches (30.150 mm)
• Outside Diameter: 2.000 inches (50.800 mm)
• Thickness/Width: 0.250 inches (6.350 mm)
• Housing Bore Diameter: Approximately 1.996 inches (50.700 mm)
• Part Number: 40576S
• Compatible with Jeep CJ5 and Wagoneer drive axles

Detailed Product Description

The National 40576S drive axle shaft seal is part of the 40000 series, designed specifically for driveline and axle applications requiring precise sealing solutions. Its nitrile construction offers excellent resistance to petroleum-based fluids and mechanical wear, ensuring a tight seal around the axle shaft. The seal’s dimensions, including a 1.187-inch inside diameter and a 2.000-inch outside diameter, match the specifications needed for Jeep CJ5 and Wagoneer models, providing a secure fit within the housing bore of approximately 1.996 inches. The 0.250-inch thickness balances durability with flexibility to maintain effective sealing under rotational stress.

Common Applications and Problem Solving

• Prevents oil leaks from the drive axle shaft area
• Protects axle bearings from contamination by dirt and debris
• Maintains proper lubrication within the axle assembly
• Reduces risk of premature axle wear due to fluid loss
• Helps avoid costly drivetrain repairs related to seal failure

Installation Notes and Tips

When installing the National 40576S seal on Jeep CJ5 or Wagoneer models, ensure the housing bore and shaft surfaces are clean and free of debris. Use appropriate tools to press the seal evenly into the housing bore without distortion. Avoid using excessive force or sharp tools that could damage the nitrile sealing lip. Lubricate the seal lip lightly with clean axle oil before installation to reduce initial wear and facilitate proper seating.

Quality Assurance and Warranty

National manufactures the 40576S drive axle shaft seal to meet industry standards for durability and performance. The nitrile material and precise dimensions are tested to ensure consistent sealing capability. While specific warranty details may vary, National typically offers coverage against manufacturing defects, supporting the reliability expected for Jeep CJ5 and Wagoneer driveline components.