National 5778V Differential Pinion Seal - Front Outer or Rear Outer

National 5778V Differential Pinion Seal Overview

The National 5778V differential pinion seal is engineered to provide reliable sealing performance for a range of vehicles including Chevrolet, Ford, Dodge, and Jeep models. Designed with precision dimensions and durable fluoro-elastomer material, this oil seal helps maintain proper lubrication and prevents leaks in driveline systems.

• Inside diameter: 1.552 inches (39.420 mm)
• Outside diameter: 3.165 inches (80.390 mm)
• Thickness/width: 0.645 inches (16.383 mm)
• Material: Fluoro-elastomer for enhanced chemical and heat resistance
• Compatible with housing bore approximately 3.160 inches (80.260 mm)

Technical Specifications and Design Details

The 5778V differential pinion seal from National is part of the 5000 series and features a 72 type design optimized for differential pinion shafts. Its fluoro-elastomer construction offers resistance to oil, heat, and wear, ensuring long service life in demanding driveline environments. The seal’s precise inside diameter of 1.552 inches matches the shaft size for a secure fit, while the outside diameter of 3.165 inches fits tightly within the housing bore of 3.160 inches, preventing fluid leakage. The 0.645-inch thickness provides adequate sealing surface area without compromising installation space.

Compatible Vehicles and Applications

This differential pinion seal is compatible with a wide range of vehicles, including Chevrolet Blazer, C10 Suburban, Corvette, and Silverado models; Ford Bronco, F-150, F-250, and F-350 trucks; Dodge Ram 1500 and 2500; Jeep Cherokee, Grand Cherokee, Wrangler, and TJ; as well as GMC, Honda, Isuzu, and Lincoln models. The 5778V seal is designed to maintain differential integrity by preventing oil leaks and contamination in these driveline systems.

Common Issues Addressed by the 5778V Differential Pinion Seal

• Prevents oil leaks from the differential pinion shaft
• Reduces contamination ingress into the differential housing
• Maintains proper lubrication for differential gears
• Minimizes wear on driveline components caused by fluid loss
• Helps avoid costly differential repairs due to seal failure

Installation Notes and Tips

When installing the National 5778V differential pinion seal, ensure the housing bore is clean and free of debris. Use appropriate tools to press the seal evenly into place without damaging the sealing lip. Verify the shaft surface is smooth and free of nicks or grooves to prevent premature seal wear. Lubricate the seal lip lightly with gear oil before installation to reduce initial friction. Proper alignment and careful handling during installation will help achieve optimal sealing performance.

Quality Assurance and Warranty

National manufactures the 5778V 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 common in automotive driveline applications. While specific warranty terms may vary, National products typically come with a limited warranty against defects in material and workmanship, providing confidence in the seal’s reliability for compatible Chevrolet, Ford, Dodge, Jeep, and other vehicle models.