National 710998 Differential Pinion Seal - Rear Outer

National 710998 Differential Pinion Seal Overview

The National 710998 differential pinion seal is engineered to provide reliable sealing performance for driveline applications. Designed for select Cadillac, Chrysler, Dodge, Pontiac, and Saturn models, this oil seal helps maintain proper lubrication and prevents leaks in the differential assembly.

• Inside diameter: 2.244 inches (57.0 mm)
• Outside diameter: 3.319 inches (84.3 mm)
• Flanged outside diameter: 3.465 inches (88.0 mm)
• Thickness: 0.437 inches (11.1 mm)
• Material: Durable fluoro-elastomer for enhanced resistance
• Helix type: Clockwise-spiral lip design for effective sealing
• Compatible housing bore: 3.307 inches (84.0 mm)

Technical Details and Specifications

The National 710998 differential pinion seal features a fluoro-elastomer construction, which offers excellent chemical and temperature resistance, making it suitable for demanding automotive environments. The seal’s clockwise-spiral lip design ensures a tight fit around the pinion shaft, minimizing oil leakage and contamination ingress. With an inside diameter of 2.244 inches and an outside diameter of 3.319 inches, this seal fits precisely within a housing bore of 3.307 inches. The flanged outside diameter of 3.465 inches provides additional stability during installation and operation. Overall width with side lip measures 0.602 inches (15.3 mm), ensuring proper sealing depth and contact.

Compatible Vehicles and Applications

This differential pinion seal is compatible with various models from Cadillac, Chrysler, Dodge, Pontiac, and Saturn. Specifically, it fits vehicles such as the Cadillac CTS, SRX, and STS; Chrysler 300; Dodge Challenger and Charger; Pontiac G6 and Solstice; and Saturn Sky. The part number 710998 is designed to meet the OEM specifications for these models, ensuring proper fit and function in the driveline and axle assemblies.

Common Issues Addressed by the National 710998 Seal

• Prevents differential oil leaks that can cause driveline damage
• Reduces contamination entry into the differential housing
• Maintains proper lubrication of the pinion shaft
• Minimizes wear on differential components due to oil loss
• Helps avoid costly repairs related to seal failure

Installation Notes and Tips

When installing the National 710998 differential pinion seal, ensure the housing bore and shaft surfaces are clean and free of debris. Use appropriate tools to press the seal evenly into the bore without damaging the flanged edge or sealing lip. Verify the seal orientation matches the clockwise-spiral lip design for optimal sealing performance. Lubricate the seal lip lightly with differential oil before installation to reduce initial wear. Check for proper seating and alignment to avoid premature failure.

Quality Assurance and Warranty

National manufactures the 710998 differential pinion seal to meet strict quality standards, using fluoro-elastomer materials for durability and resistance to heat and chemicals. This part is part of the 710900 series, known for consistent performance in driveline sealing applications. While specific warranty details may vary, National typically offers coverage against manufacturing defects to ensure customer confidence in the product’s reliability.