FORD 2013 F-550 v.3 - Manual (Page 212)

4X4 LOW - Continuously illuminates when 4L is selected.
CHECK 4X4 - Displays when a 4X4 fault is present.
Using a Manual Shift On Stop (MSOS) 4wd system (if equipped)
Note: High shift efforts may be encountered when attempting to shift
into and out of 4x4 modes. It is recommended to allow the vehicle to roll
at a speed below 3 mph (5 km/h) when shifting between modes.
• 2H (2WD): For general on-road
driving. Sends power to the rear
wheels only and should be used
for street and highway driving.
Provides optimal smoothness and
fuel economy at high speeds.
• 4H (4x4 High): Used for extra
traction such as in snow or icy
roads or in off road situations.
This mode is not intended for
use on dry pavement.
• N (Neutral): Only used when towing the vehicle. No power to front
or rear wheels.
• 4L (4x4 Low): Uses extra gearing to provide maximum power to all
four wheels at reduced speeds. Intended only for off road applications
such as deep sand, steep grades or pulling heavy objects.
Shifting between system modes
Note: Do not perform these operations if the rear wheels are slipping.
Note: Some noise may be heard as the 4x4 system shifts or engages.
This is normal. In order to reduce engagement noise, it is recommended
that all shifts be performed at speeds below 3 mph (5 km/h).
Note: The vehicle should not be driven in 4X4 High with the hub locks
disengaged as this condition may damage driveline system components.
• Engage the locking hubs by rotating the hub lock control from FREE
to LOCK, then move the transfer case lever from 2H (2WD) to 4H
(4x4 High) at a stop or a vehicle speed below 3 mph (5 km/h).
Four-Wheel Drive (If Equipped) 211
2013 F-250/350/450/550 (f23)
Owners Guide gf, 3rd Printing, December 2012
USA (fus)