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 - Electronic Shift >> Principles of Operation >> Electronic Shift Vacuum Schematic