Power Train Components PT4278 Differential Pinion Seal

The Power Train Components PT4278 is a premium differential pinion seal designed to prevent lubricant leakage and protect against contaminants in rear differential assemblies. This seal is engineered to precise OE specifications for reliable sealing performance in demanding drivetrain applications.

Key Features:

• Machined rubber sealing edge provides superior sealing surface for leak prevention
• Spring-loaded multi-lip design ensures consistent contact with the pinion shaft
• Fluoro-elastomer construction offers excellent resistance to heat, oil, and automotive fluids
• Flanged design simplifies installation and prevents cocking during assembly
• Extra dust boot lip keeps harmful contaminants out while protecting against rust and corrosion
• Latex core compensates for minor bore imperfections and seals the outer diameter leak path

Specifications:

• Inside Diameter: 1.812 inches (46.02mm)
• Outside Diameter: 3.096 inches (78.64mm)
• Flanged OD: 3.400 inches (86.36mm)
• Seal Thickness: 0.485 inches (12.32mm)
• Bore Diameter: 3.095 inches (78.61mm)
• Material: Fluoro-elastomer with Redicoat finish

This differential pinion seal is designed for rear outer seal applications and is commonly used in Ford and Lincoln vehicles including F-150, F-250, F-350, E-Series vans, and Navigator models. Cross-references to OEM part numbers include 1L3Z-4676-A, E5TZ4676A, and various Ford service numbers.