2013 Ford F350 Super Duty Super Cab Owner Manual Printing 3 - Page 210

Four-Wheel Drive (If Equipped) USING FOUR-WHEEL DRIVE (4WD) (IF EQUIPPED ) 209 WARNING: For important information regarding safe operation of this type of vehicle, see General Information in the Wheels and Tires chapter. Note: Do not use 4X4 mode on dry, hard surfaced roads. Doing so will produce excessive noise, increase tire wear and may damage drive components. 4X4 mode is only intended for consistently slippery or loose surfaces. Note: If 4X4 low is selected while the vehicle is moving above 3 mph (5 km/h), the 4WD system will not perform a shift. This is normal and should be no reason for concern. Refer to Shifting to/from 4L (4X4 Low) for proper operation. Manual Shift On Stop (MSOS) 4WD system (if equipped) Note: 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. Note: The vehicle should not be driven in 4X4 High or 4X4 Low modes with the hub locks set to FREE as this condition may damage driveline system components. 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. Electronic Shift-On-the-Fly (ESOF) 4WD system (if equipped) Note: If 4X4 Low is selected while the vehicle is moving above 3 mph (5 km/h), the 4WD system will not perform a shift. This is normal and should be no reason for concern. Refer to Shifting to/from 4L (4X4 Low) for proper system operation. 2013 F-250/350/450/550 (f23) Owners Guide gf, 3rd Printing, December 2012 USA (fus)