2009 Ford F350 Super Duty Crew Cab Owner's Manual - Page 297

Driving Manual Shift On Stop (MSOS) 4x4 system (if equipped) The 4WD system is engaged or disengaged by rotating the control for both front wheel hub locks from the FREE or LOCK position, then manually engaging or disengaging the transfer case with the floor-mounted shifter. For increased fuel economy in 2WD, rotate both hub locks to the FREE position. • For proper operation, make sure that each hub is fully engaged and that both hub locks are set to the same position (both set to LOCK or both set to FREE). To engage LOCK, turn the hub locks completely clockwise; to disengage the hubs (FREE), turn the hub locks completely counterclockwise. • Some vehicles may be equipped with wheel ornaments that cover the 4x4 manual hub lock. These ornaments must be removed to access the manual hub locks. Electronic Shift On the Fly (ESOF) 4x4 system (if equipped) If equipped with the electronic shift 4WD System, and the instrument panel control is moved to 4X4 LOW while the vehicle is moving above 5 mph (8 km/h), the system will not engage and no damage will occur to the 4WD system. Before 4X4 LOW can be engaged, the vehicle speed must be below 5 mph (8 km/h) with the transmission in N (Neutral). If your vehicle is equipped with a manual transmission, the clutch pedal also must be depressed. The 4x4 Low indicator will flash continuously until these actions are performed by the user. This vehicle is equipped with a non-synchronous low range gearset which will not allow the transfer case to shift into 4X4 LOW if vehicle speed is above 5 mph (8 km/h). It is recommended that a shift to 4X4 LOW is performed while the vehicle is rolling at a speed below 5 mph (8 km/h). 297 2009 F-250/350/450/550 (f23) Owners Guide, 3rd Printing USA (fus)