National 711047 Differential Pinion Seal - Front Outer

Overview of National 711047 Differential Pinion Seal

The National 711047 differential pinion seal is engineered to provide reliable sealing performance for driveline and axle assemblies. Designed with precision dimensions and durable fluoro-elastomer material, this oil seal helps maintain proper lubrication and prevent leaks in various vehicle applications.

• Inside diameter: 2.560 inches (65.000 mm)
• Outside diameter: 4.220 inches (107.200 mm)
• Thickness: 0.394 inches (10.000 mm)
• Overall width with side lip: 0.630 inches (16.000 mm)
• Material: Fluoro-elastomer for enhanced chemical and temperature resistance
• Part number: 711047, Series 711000

Technical Specifications and Material Details

This differential pinion seal from National is constructed using fluoro-elastomer, a material known for its resistance to heat, oil, and chemical degradation. The seal features an inside diameter of 2.560 inches (65 mm) and an outside diameter of 4.220 inches (107.2 mm), making it suitable for housings with a bore diameter of approximately 4.213 inches (107 mm). The thickness of 0.394 inches (10 mm) and an overall width including the side lip of 0.630 inches (16 mm) ensure a secure fit and effective sealing around the pinion shaft.

Applications and Vehicle Compatibility

The National 711047 differential pinion seal is compatible with a range of driveline and axle assemblies requiring a 2.560-inch shaft diameter and a housing bore near 4.213 inches. It is commonly used in automotive differentials where maintaining oil containment and preventing contamination is critical. This seal is suitable for vehicles such as Ford F-Series trucks, Chevrolet Silverado, and Dodge Ram models that specify similar seal dimensions.

• Prevents oil leaks in differential pinion shafts
• Protects against dirt and debris intrusion
• Maintains lubrication integrity for driveline components
• Reduces wear on pinion bearings and gears
• Helps avoid costly differential repairs due to seal failure

Installation Notes and Tips

When installing the National 711047 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 oil retention. Lubricate the seal lip lightly with gear oil before installation to reduce initial wear.

Quality Assurance and Warranty Information

National manufactures the 711047 differential pinion seal to meet industry standards for durability and performance. The use of fluoro-elastomer material provides resistance to harsh operating conditions commonly found in automotive differentials. While specific warranty details are not provided, National products typically adhere to strict quality control processes to ensure reliable service life.