The Warn 38826 is a pair of heavy-duty premium manual locking hubs engineered for 1999–2004 Ford Super Duty F-250 and F-350 single-rear-wheel trucks, Excursions, and Dana 50 / Dana 60 front drive axles. Stepping up from standard hubs, the Premium series features an all-metal internal design, heavy-duty ZA-27 zinc-aluminum alloy dial housings, chrome plating for corrosion resistance, and heat-treated internal wave springs. Warn designs these 30-spline hubs with longer clutch-ring spline teeth and thicker body walls to handle high torque loads, paired with a positive 9/10-turn dial and heavy internal detents to guarantee the hubs stay locked under harsh off-road conditions.

Stripped plastic internal hub gears, failing vacuum pulse seals on electronic shift-on-the-fly (ESOF) systems, hubs unlocking or popping out under heavy front axle torque, and vacuum leaks causing cab air conditioning to default to defrost are what this upgrade cures. Factory Ford auto/manual vacuum hubs rely on brittle plastic ratchets, thin springs, and delicate rubber seals that degrade from water intrusion, mud, and road salt. Under high load or when vacuum fails, stock hubs slip, pop, or refuse to lock entirely. The Warn 38826 replaces fragile vacuum and plastic components with an ultra-durable, all-metal mechanical link between the wheel hub and the 30-spline axle stub shaft. It is sold as a complete axle pair (driver and passenger side hubs with retaining snap rings and O-rings); front axle stub shafts, unit wheel bearings, and vacuum line block-off caps are sold separately.

It fits 30-spline Dana 50 and Dana 60 front drive axles on 1999–2004 Ford Super Duty SRW trucks, 2000–2005 Excursions, and 1978–1997 Ford F-250 / F-350 trucks (does not fit 1999–2004 dual-rear-wheel / dually models due to front hub adapter interference).

Fitment

• 1999–2004 Ford F-250 Super Duty 4WD (Dana 50 / Dana 60 Front Axle)
• 1999–2004 Ford F-350 Super Duty 4WD Single Rear Wheel (Dana 50 / Dana 60 Front Axle)
• 2000–2005 Ford Excursion 4WD (Dana 50 / Dana 60 Front Axle)
• 1978–1997 Ford F-250 / F-350 Heavy Duty 4WD (Dana 50 / Dana 60 Front Axle)
• 1977–1991 Chevy / GMC 1-Ton K30 / V3500 (Dana 60 Front Axle)
• 1990–1993 Dodge W250 / W350 (Dana 60 Front Axle with internal splines)
• Fits front drive axles with 30-spline outer stub shafts (SRW only; not for 99-04 DRW)
• All-metal internal construction with ZA-27 zinc-aluminum alloy dials and chrome finish
• Heavy internal wave spring technology and deep dial detents prevent unwanted disengagement
• Full 9/10-turn manual actuation for positive gear-to-clutch engagement
• Direct bolt-in replacement for factory Ford manual or vacuum-operated ESOF hubs
• Complete pair of locking hubs (driver and passenger sides) with snap rings and O-rings

Park the vehicle on a level surface, set the emergency parking brake, and remove the front wheels or center caps for clear access to the hub bore. Using external snap-ring pliers, remove the large outer retaining ring located inside the wheel bearing hub bore, then slide the factory hub assembly out. Thoroughly clean all residual grease, road salt, and rust from the wheel unit bearing splines and the 30-spline axle stub shaft using brake cleaner and a wire brush. Apply a light film of clean waterproof chassis grease or synthetic assembly lube directly to the splines and moving parts—never pack the internal lockout body full of heavy grease, as cold ambient temperatures will cause thick grease to hydraulically block the internal wave spring and prevent gear engagement. Slide the Warn hub body into the hub bore until fully seated, install the large outer retaining ring into its designated groove, fit the dial assembly, and tighten the cap screws in an alternating pattern. When converting from factory vacuum ESOF hubs, disconnect and cap the rubber vacuum lines at each steering knuckle to prevent engine vacuum drops and HVAC defrost mode defaults.