Spicer Front Outer Axle Stub Shaft, SPL55-4X U-Joint & Seal Overhaul Kit for 1998-2004 Ford Super Duty (Dana 50 / 60, Single Side)

Eliminate harsh front-end wheel vibrations, restore your automatic four-wheel-drive engagement, and completely rebuild a single outer wheel end with this genuine Spicer Dana 50/60 Overhaul Kit. Specifically packaged as an all-in-one, single-side restoration solution for 1998–2004 Ford F-250 and F-350 Super Duty 4x4 trucks and 2000–2005 Ford Excursion models, this premium kit includes all the primary rotating axle hardware and multi-lip vacuum seals required to refresh either the driver or passenger side of your front axle.

On leaf-spring Ford Super Duty platforms, the front solid axle endures incredible structural and rotational strain under the immense weight of the 7.3L or 6.0L PowerStroke Turbo Diesel engines. Over decades of heavy commercial towing, snowplowing, or trail riding with oversized tires, the outer steel stub shaft (yoke shaft) naturally fatigues. Common failure points include twisted outer splines, deep rust pitting on the hub-seal journal, or ovaled-out universal joint ears caused by a binding front U-joint. Left unchecked, a dry or failing U-joint causes severe steering wheel feedback, tire scrubbing, and can eventually snap completely—destroying your outer wheel end assembly. Simultaneously, the massive primary knuckle vacuum seal integrated into this platform dry-rots or tears over time. When it fails, your Electronic Shift-on-the-Fly (ESOF) system loses vacuum pressure, leaving your dashboard-controlled automatic 4WD completely inoperable.

This original equipment manufacturer (OEM) overhaul package eliminates the hassle of tracking down individual components by combining a rugged outer stub shaft with a premium Spicer Life Series SPL55-4X non-greaseable universal joint. This heavy-duty U-joint features a cold-forged steel cross and advanced multi-lip synthetic rubber seals to permanently lock out trail mud, water, and sand while maximizing internal needle bearing life. The kit also includes the factory-correct primary vacuum knuckle seal and updated outer axle tube dust seal to re-establish an absolute, airtight fluid and debris barrier. Sourcing a genuine Spicer bundle ensures exact original equipment tolerances, uncompromised metallurgy, and matching factory blueprints for a seamless, long-lasting repair.

Kit Contents (Services One Front Steering Knuckle Wheel End):

• (1) Genuine Spicer Forged Steel Front Outer Axle Stub Shaft

• (1) Premium Spicer Life Series SPL55-4X Maintenance-Free Front Axle U-Joint

• (1) Premium Multi-Lip Outer Axle Stub Shaft Vacuum Knuckle Seal (Part # 50491 / F81Z-3254-CB)

• (1) Updated Multi-Lip Outer Axle Tube Dust Seal (Part # 50381 / F81Z-1S175-HCA)

• Complete Set of Internal/External Retaining Snap Rings and Thrust Washers

Kit Highlights:

• All-In-One Single Side Solution: Supplies exactly enough factory-correct hardware and specialized seals to fully overhaul either the left or right front outer wheel end without buying parts you don't need.

• Restores ESOF 4x4 Function: Provides a fresh, original equipment vacuum seal to eliminate vacuum drop-off, ensuring your automatic locking hub engages instantly when you switch to 4WD.

• Premium SPL55-4X Solid-Cross U-Joint: Features a cold-forged, non-greaseable universal joint engineered with advanced thrust washers and tight seals to withstand immense torsional leverage and high thermal loads.

• Genuine Spicer OEM Quality: Precision-machined and induction-hardened by the vehicle's original axle supplier to guarantee strict structural compliance and perfect alignment with your factory inner axle shaft and hub unit.

Vehicle & Axle Fitment:

• Axle Profiles: Solid Monobeam / Leaf-Spring Front Dana 50 and Dana 60 Axles equipped with open knuckles and vacuum-operated or manual locking hubs. Does not fit later 2005+ coil-spring Dana Super 60 axle configurations.

• Ford F-250 Super Duty: 1998, 1999, 2000, 2001, 2002, 2003, and 2004 4x4 truck models.

• Ford F-350 Super Duty: 1998–2004 Single-Rear-Wheel (SRW) and Dual-Rear-Wheel (DRW) dually 4x4 models.

• Ford Excursion: 2000, 2001, 2002, 2003, 2004, and 2005 4x4 SUV configurations.

• Position: Front Outer Axle Wheel End — Left (Driver) or Right (Passenger) Side (Note: Two kits required if overhauling both sides of the vehicle).