Spicer Front Outer Axle Stub Shaft & Knuckle Vacuum Seal Kit for Ford Super Duty (Dana 50/60, 1999-2004)

Restore original drivetrain strength and fix problematic vacuum leaks on a single side of your truck with this genuine Spicer Front Outer Axle Stub Shaft and Knuckle Seal Kit. Specially bundled for 1999–2004 Ford F-250 and F-350 Super Duty trucks equipped with Dana 50 or Dana 60 front axles, this service kit pairs a premium replacement outer axle shaft with its critical mating seal hardware.

Heavy-duty commercial use, massive towing demands, and off-road trail conditions place immense load on the front outer stub shafts and steering knuckle seals of these trucks. Over time, stub shaft splines can twist or strip, and the main hub vacuum seal will degrade—causing automated four-wheel-drive systems to fail to lock into place. Sourcing individual pieces can delay your repair, so this kit eliminates the guesswork by packaging a high-strength outer stub shaft along with the critical main inner knuckle vacuum seal, thrust washers, snap rings, and needle bearing components. Choosing genuine Spicer OEM parts ensures exact factory dimensions, direct structural integrity, and long-term fluid protection.

Kit Highlights:

• Essential Single-Side Pair: Combines one premium outer axle stub shaft along with the heavy-duty main outer axle-to-knuckle vacuum seal and matching thrust washer hardware.

• Genuine Spicer OEM Quality: Forged from premium, heat-treated steel alloy and specialized elastomeric compounds to handle extreme torque spikes and resist tearing.

• Fixes Common Automated 4WD Issues: Replaces dried or damaged factory knuckle hub seals to immediately restore the vacuum pressure required for reliable automatic Pulse Vacuum Hub (PVH) engagement.

• Direct Application Fit: Engineered specifically to meet original equipment standards for leaf-sprung 1999–2004 Ford Super Duty monobeam Dana 50 and Dana 60 front axle assemblies.

Vehicle & Axle Fitment:

• Make: Ford

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

• Years: 1999, 2000, 2001, 2002, 2003, 2004

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

• Position: Front Outer Axle Shaft / Steering Knuckle Assembly (Fits Left or Right Side - Sold Individually)