National 4525V Differential Pinion Seal - Rear Outer

National 4525V Differential Pinion Seal Overview

The National 4525V differential pinion seal is engineered to provide reliable sealing performance for heavy-duty vehicles. Designed for use in Chevrolet, Dodge, Ford, and GMC models such as the C3500, F-350 Super Duty, P30, P3500, Ram 2500, and Ram 3500, this oil seal helps maintain differential integrity by preventing fluid leaks.

• Inside diameter: 2.500 inches (63.5 mm)
• Outside diameter: 4.040 inches (102.62 mm)
• Thickness: 0.419 inches (10.643 mm)
• Overall width with side lip: 0.630 inches (16 mm)
• Material: durable fluoro-elastomer for enhanced resistance to heat and chemicals
• Housing bore diameter: 4.035 inches (102.49 mm)
• Series: 4000, Type 72 design

Technical Details and Material Specifications

The National 4525V differential pinion seal features a fluoro-elastomer construction, which offers superior resistance to oil, heat, and wear compared to standard rubber seals. Its precise dimensions, including a 2.5-inch shaft diameter and a 4.04-inch outside diameter, ensure a secure fit within the differential housing bore of approximately 4.035 inches. The 0.419-inch thickness and 0.630-inch overall width with side lip provide effective sealing to prevent oil leaks and contamination.

Compatible Vehicles and Applications

This differential pinion seal is compatible with a range of heavy-duty trucks and vans, including Chevrolet C3500, Dodge Ram 2500 and 3500, Ford F-350 Super Duty, and GMC P30 and P3500 models. The National 4525V is designed specifically for driveline and axle sealing systems, making it suitable for maintaining the integrity of differential assemblies in these vehicles.

Common Issues Addressed by the National 4525V Seal

• Prevents differential oil leaks that can cause lubrication failure
• Reduces contamination ingress to protect internal differential components
• Minimizes wear on the pinion shaft by maintaining proper lubrication
• Helps avoid costly differential repairs due to seal failure
• Maintains optimal differential performance under heavy-duty operating conditions

Installation Notes and Tips

When installing the National 4525V 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 sealing function. Lubricate the seal lip lightly with differential oil before installation to reduce initial wear.

Quality Assurance and Warranty

National manufactures the 4525V differential pinion seal to meet industry standards for durability and performance. The fluoro-elastomer material and precise dimensional tolerances contribute to long service life. While specific warranty details may vary, National products typically come with a limited warranty against manufacturing defects, ensuring reliability for your vehicle's driveline system.