Ford 9in Axle Seal

The Sealed Power Ford 9-inch Axle Seal (part number 51098) is a precision pinion yoke seal engineered for Ford 9-inch differentials. This seal maintains critical fluid retention at the pinion shaft while preventing contamination and leakage—essential for sustained differential performance in both street and competition applications. Built by Sealed Power, a manufacturer with deep heritage in OEM sealing solutions, this 2.5-inch OD seal delivers the reliability expected in drivetrain sealing.

The seal's 1.5-inch shaft diameter and 7/16-inch width are sized specifically for Ford 9-inch pinion geometry, ensuring a factory-correct fit without modification. The rubber construction resists mineral oil-based differential fluid while maintaining elasticity across typical operating temperatures. Proper sealing at the pinion yoke is critical—even minor weeping can lead to fluid loss under highway vibration and dynamic load, ultimately compromising gear lubrication and bearing life. Sealed Power's design addresses this through proven elastomer composition and precision bore tolerances.

This seal is the correct specification for stock and modified Ford 9-inch differentials used in hot rods, street machines, truck builds, and classic muscle cars. Rebuilding a differential or addressing a weeping pinion seal requires replacement with an OEM-equivalent component. The Sealed Power 51098 meets that requirement without premium pricing, making it an economical choice for both professional shop rebuilds and owner-operator maintenance. Installation requires basic differential access and standard removal of the pinion yoke.