Spicer Front Axle Outer Knuckle Vacuum Seal Kit for Ford F-250 & F-350 (Dana 50/60, 1998-2004, Both Sides)

Restore the factory performance of your automatic 4x4 engagement system with this genuine Spicer Front Axle Outer Knuckle Vacuum Seal Kit. Specially engineered to service both the driver and passenger sides of leaf-sprung 1998–2004 Ford F-250 and F-350 Super Duty trucks (and 2000–2005 Ford Excursion models) equipped with a monobeam Dana 50 or Dana 60 front axle, this premium dual-side seal kit fixes the primary cause of automated 4WD failures.

The early Super Duty platform utilizes a specialized Pulse Vacuum Hub (PVH) system to lock the front hubs automatically from the dashboard switch. Over years of service, the main outer knuckle seals degrade, crack, or harden due to heat and road debris. When this seal loses its airtight isolation, the vacuum drops out, forcing you to manually turn the front dial locks at the wheel end to get traction.

This kit eliminates vacuum leaks at the steering knuckle by providing original equipment, multi-lip seals built to withstand continuous spindle rotation and severe weather conditions. Sourcing this genuine factory package ensures your pneumatic system holds a flawless vacuum seal, giving you back the convenience of on-the-fly, in-cab 4WD activation.

Kit Highlights:

• Complete Dual-Side Hub Service: Contains 2 genuine Spicer premium outer knuckle vacuum hub seals and the necessary wheel hub assembly o-rings to fully service both front outer axle ends.

• Genuine Spicer OEM Quality: Manufactured by the original equipment supplier to strict structural and material tolerances, offering a perfect press-fit that generic aftermarket replacements cannot match.

• Restores Automatic 4x4 Function: Specifically designed to fix pneumatic air leaks, ensuring error-free automatic hub lock engagement from your dashboard selector.

• Premium Elastomer Compound: Engineered with heavy-duty multi-lip synthetic rubber that resists grease breakdown, road salt corrosion, and moisture intrusion.

Vehicle & Axle Fitment:

• Make: Ford

• Models: F-250 Super Duty / F-350 Super Duty / Excursion (4WD Models)

• Years: Trucks: 1998, 1999, 2000, 2001, 2002, 2003, 2004 | Excursion: 2000, 2001, 2002, 2003, 2004, 2005

• Axle Profile: Front Monobeam Dana 50 & Dana 60 (Leaf Spring Front Suspension Configurations Only)

• Position: Front Outer Steering Knuckle Hubs (Left and Right Sides)