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Home >> Ford >> 2004 >> Excursion 6.8 S, 4WD >> Repair and Diagnosis (Single Page) >> Drivelines & Axles >> Locking Hubs >> Four-Wheel Drive Systems - Excursion & F250-F550 Super Duty >> Diagnosis And Testing >> Four-Wheel Drive Systems - Mechanical Shift >> Principles of Operation >> 4X4 ESOF Locking Hub

4X4 ESOF Locking Hub

Many system components are involved in the correct operation of the ESOF (Electronic Shift-On-The-Fly) locking hubs on 1999 and newer Super Duty and Excursion 4X4 vehicles. Before diagnosing the hub locks themselves as the cause of 4X4 concerns, be sure to verify all related system components.

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