Ford F250/F350 Super Duty Dana 50/60 Front Axle Seal & U-Joint Kit 1998-2004 (SPL55-4X)

Eliminate harsh front-end driveline vibrations, restore your automatic four-wheel-drive engagement, and protect your wheel ends from trail debris with this genuine Spicer Front Axle Seal & U-Joint Overhaul Kit. Specifically packaged as a focused, single-side maintenance solution for 1998–2004 Ford F-250 and F-350 Super Duty 4x4 trucks and 2000–2005 Ford Excursion models, this premium hardware bundle includes the primary rotating components and multi-lip 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 time, the front axle shaft universal joints naturally dry out, flat-spot, or suffer moisture intrusion from deep water crossings. A binding or dry U-joint causes severe steering wheel feedback, tire scrubbing, and accelerated hub unit bearing wear—and left unchecked, it can snap entirely, taking out your expensive inner and outer axle shafts. Simultaneously, the massive primary knuckle vacuum seal integrated into this assembly can dry-rot or tear. When it fails, your Electronic Shift-on-the-Fly (ESOF) system loses vacuum pressure, instantly disabling your dashboard-controlled automatic 4WD.

This original equipment manufacturer (OEM) service package eliminates the hassle of sourcing individual components by pairing a premium Spicer Life Series SPL55-4X non-greaseable universal joint with the factory-correct primary vacuum knuckle seal and an updated outer axle tube dust seal. The included dust seal presses into the end of the housing tube to block water, road salt, and mud from migrating down the tube toward your inner differential seals. Sourcing a genuine Spicer service 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) 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 Retaining Snap Rings and Seals

Kit Highlights:

• Focused Single-Side Service Pack: Supplies exactly enough factory-correct hardware and specialized seals to fully overhaul either the left or right front outer wheel end without paying for 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/outer axle shafts and hub units.

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).