National 340356 Wheel Seal - Rear or Rear Outer

Overview of National 340356 Wheel Seal

The National 340356 wheel seal is engineered to provide reliable sealing performance for driveline and axle applications. Designed with precision, this oil seal helps maintain proper lubrication and prevents contaminants from entering critical components in vehicles such as Ford F-150 and Chevrolet Silverado models.

• Inside diameter: 1.250 inches (31.750 mm)
• Outside diameter: 1.696 inches (43.080 mm)
• Housing bore: 1.686 inches (42.820 mm)
• Width: 0.218 inches (5.540 mm)
• Material: durable nitrile rubber for resistance to oil and wear
• Part type: wheel seal, part number 340356
• Series: 340000, Type 34

Detailed Product Description

The National 340356 wheel seal is constructed from nitrile, a synthetic rubber known for its excellent resistance to petroleum-based oils and greases. This seal features an inside diameter of 1.250 inches and an outside diameter of 1.696 inches, making it suitable for axle shafts requiring precise sealing dimensions. The housing bore measures 1.686 inches, ensuring a secure fit within the axle assembly. With a width of 0.218 inches, this oil seal maintains a compact profile while providing effective sealing to prevent oil leaks and contamination.

Part of the National 340000 series, the 340356 wheel seal is designed for durability and consistent performance in demanding automotive environments. It is compatible with various driveline and axle configurations commonly found in Ford F-150 and Chevrolet Silverado trucks, among others.

Common Applications and Problem Solving

• Prevents oil leaks from axle shafts in Ford F-150 and Chevrolet Silverado vehicles
• Protects driveline components from dirt, dust, and moisture intrusion
• Maintains lubrication integrity to reduce wear on axle bearings
• Helps avoid costly repairs related to seal failure and axle damage
• Ensures proper fitment in axle housings with a 1.686-inch bore diameter

Installation Notes and Tips

When installing the National 340356 wheel seal, ensure the axle shaft and housing bore 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 oil retention. Lubricate the seal lip lightly with clean oil before installation to reduce initial wear.

Quality Assurance and Warranty

National wheel seals are manufactured to meet industry standards for durability and performance. The 340356 part undergoes rigorous quality control to ensure dimensional accuracy and material integrity. While specific warranty details are not provided, National products typically adhere to OEM specifications to support reliable service life in automotive driveline applications.