National 4278 Differential Pinion Seal offers unmatched reliability and performance for your vehicle's drivetrain. Featuring advanced multi-lip and spring-loaded design, this seal expertly withstands temperatures from -40°F to 400°F, providing exceptional sealing performance in even the harshest environments. Ideal for both seasoned mechanics and DIY enthusiasts, this part ensures your differential remains free from harmful contaminants, improving vehicle longevity. The legacy of National Bearings stands behind 75 years of commitment to premium sealing solutions. Compatible with a wide range of vehicles, the National 4278 guarantees perfect fit and function. By reducing friction and leakage, this pinion seal is an essential component for optimal vehicle maintenance, ensuring your differential operates smoothly and efficiently. Upgrade your drivetrain by investing in quality and trust with National's precision-engineered solutions.

• Withstands extreme temperatures:
• 40°F to 400°F
• Multi-lip, spring-loaded design for strong sealing
• Fluoro-Elastomer material for superior resilience
• Compatible with various automotive fluids
• Reliable performance for all repair types

Flanged Outside Diameter (Inch):	3.400
Inside Diameter (Inch):	1.812
Material:	Fluoro-Elastomer
Redicoat:	Yes
Thickness (Inch):	0.485
Shaft Diameter (Inch):	1.812
Series:	4000
Weight:	0.2000 lbs

• Chicago Rawhide: 18024
• Chicago Rawhide: 18062A
• Ford: 1L3W-4676-AB
• Ford: 1L3W-4676-AC
• Ford: 1L3W4674AA
• Ford: 1L3Z-4676-A
• Ford: 1L3Z-4676-B
• Ford: 1L3Z-4676-C
• Ford: BL3Z-4676-A
• Ford: E5TW4676BA
• Ford: E5TZ4676A
• Ford: E5TZ4676B
• Ford: E87W4676AA
• Ford: E8TW4676AA
• Ford: E8TZ-4676B
• Ford: ESTW-4676-BA
• SKF: 18062A
• SKF: 18024
• Timken: 4278
• Victor Reinz: 48103