Spicer Front Outer Axle Shaft Knuckle Vacuum & Dust Seal Master Kit for Ford Super Duty (Dana 60, Pair)

Restore your Electronic Shift-on-the-Fly (ESOF) automatic locking hubs, block invasive trail debris, and completely overhaul your front wheel end sealing boundaries with this genuine Spicer Front Axle Master Seal Kit. Specially packaged as a complete, dual-side master bundle for 1999–2004 Ford F-350 and 2002–2004 Ford F-250 Super Duty trucks running the heavy-duty Dana 60 front end, this kit replaces all primary wear seals across both steering knuckles.

On Ford Super Duty 4x4 platforms, the automatic front locking hubs rely entirely on a persistent, airtight vacuum environment inside the steering knuckle to actuate 4WD engagement from the dashboard switch. Over high mileage, heavy towing, or exposure to harsh road conditions, the massive main knuckle seals and vacuum hub face O-rings naturally dry-rot, crack, or lose their tension. This introduces an immediate vacuum leak that leaves your automatic 4WD system unable to lock in. At the same time, the outer axle shaft dust seals decompose, leaving a gap that permits abrasive trail mud, moisture, and road grit to penetrate your front axle housing tubes and accelerate inner component wear.

This original equipment manufacturer (OEM) master service kit provides a factory-correct solution to overhaul both the driver and passenger side front steering knuckle stations simultaneously. Sourcing genuine Spicer components guarantees exact original manufacturing blueprints are met, offering the precise rubber elasticities, integrated metal casings, and multi-lip configurations required to maintain a persistent airtight vacuum seal under extreme steering deflection and heavy suspension travel.

Kit Contents (Services Both Driver & Passenger Wheel Knuckles):

• (2) Premium Main Outer Axle Shaft to Knuckle Vacuum Seals (Part # 50491 / 2023068)

• (2) Outer Wheel Hub Vacuum Face O-Rings (Part # 41766 / 701114)

• (2) Outer Axle Shaft to Tube Dust Boot Seals (Part # 50381)

Kit Highlights:

• Complete Dual-Side Master Set: Supplies all the primary outer axle shaft knuckle seals, hub O-rings, and dust boots necessary to fully overhaul both front wheel stations simultaneously.

• Restores Automatic 4WD Vacuum: Replaces the critical large-diameter main vacuum seals to completely secure your knuckle environment, bringing your dashboard Electronic Shift-on-the-Fly (ESOF) automatic hubs back to peak functionality.

• Genuine Spicer OEM Engineering: Formulated by the vehicle's original equipment axle supplier to guarantee matching factory rubber durometer ratings and precise dimensional fitment.

• Impenetrable Dust Barrier: The included outer axle shaft dust seals form a tight physical shield at the entry point of the axle tubes, keeping out highway moisture, mud, and abrasive debris.

Vehicle & Axle Fitment:

• Axle Profiles: Open-Knuckle Solid/Monobeam Front Axles: Dana 60 configurations with vacuum-operated automatic locking hubs.

• Ford F-350 Super Duty: All 1999, 2000, 2001, 2002, 2003, and 2004 4WD models.

• Ford F-250 Super Duty: 2002, 2003, and 2004 4WD models running the factory-upgraded Dana 60 front axle.

• Ford Excursion: 2002–2005 4x4 vehicles equipped with the Dana 60 front end.

• Position: Front Steering Knuckle Hub Station (Fits Left and Right Sides — 1 Kit Overhauls Entire Axle)