National 100712V Differential Pinion Seal - Front Outer or Rear Outer

National Differential Pinion Seal 100712V Overview

The National 100712V differential pinion seal is engineered to provide reliable sealing performance for a range of heavy-duty and light trucks. Designed with precision dimensions and durable fluoro-elastomer material, this oil seal helps maintain proper lubrication and prevents leaks in driveline systems.

• Inside diameter: 1.874 inches (47.6 mm)
• Outside diameter: 3.163 inches (80.34 mm)
• Flanged outside diameter: 3.504 inches (89 mm)
• Thickness: 0.500 inches (12.7 mm)
• Overall width with side lip: 0.551 inches (14 mm)
• Material: Fluoro-elastomer for enhanced chemical and temperature resistance
• Part type: Differential pinion oil seal

Technical Details and Specifications

The National 100712V differential pinion seal features a 1.874-inch inside diameter designed to fit shafts with a 47.6 mm diameter, ensuring a secure and precise fit. The outside diameter measures 3.163 inches, with a flanged outside diameter of 3.504 inches to accommodate housing bore sizes around 3.159 inches (80.24 mm). The seal thickness of 0.500 inches (12.7 mm) and an overall width including the side lip of 0.551 inches (14 mm) provide a robust sealing surface to prevent oil leakage under demanding operating conditions. Constructed from fluoro-elastomer, this seal offers resistance to heat, oil, and other automotive fluids, making it suitable for use in various driveline applications.

Compatible Vehicles and Applications

This differential pinion seal is compatible with a wide range of vehicles, including Chevrolet Silverado 1500, 2500, and 3500 series, GMC Sierra 1500 and 2500, Ford F-250 and F-350 Super Duty models, Dodge Ram 2500 and 3500 vans, Jeep Grand Cherokee and TJ, INFINITI QX56, Suzuki Equator, and Chevrolet Suburban 2500 and Tahoe. The part number 100712V ensures proper fitment for these models, providing a reliable seal for the differential pinion shaft.

Common Issues Addressed by the National 100712V Seal

• Prevents differential oil leaks that can cause driveline damage
• Reduces contamination ingress into the differential housing
• Maintains proper lubrication for differential gears and bearings
• Helps avoid costly repairs due to seal failure or wear
• Ensures consistent performance under heavy-duty and off-road conditions

Installation Notes and Tips

When installing the National 100712V differential pinion seal, ensure the 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, with the flanged side facing outward. Lubricate the seal lip lightly with gear oil before installation to reduce initial wear. Proper installation will help maintain the seal’s integrity and extend service life.

Quality Assurance and Warranty

National manufactures the 100712V differential pinion seal to meet industry standards for durability and performance. The fluoro-elastomer material is selected for its resistance to heat, oil, and chemical exposure, ensuring long-lasting service in demanding automotive environments. This part is backed by National’s quality control processes, providing confidence in fitment and function for compatible Chevrolet, Ford, Dodge, GMC, INFINITI, Jeep, and Suzuki models.