FORD 2015 F-550 v.1 - Manual (Page 156)

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).
Move the transfer case lever from 4H (4x4
High) to 2H (2WD) at a stop or a vehicle
speed below 3 mph (5 km/h), then
disengage the locking hubs (optional) by
rotating the hub lock control from LOCK
to FREE.
For proper operation, make sure that both
indicator arrows on the hub are aligned,
and that both hubs are set to either FREE
or LOCK.
Shifting to/from 4L (4x4 Low)
1. Bring the vehicle to a stop or a speed
below 3 mph (5 km/h).
2. Place the transmission in N (Neutral).
3. Move the transfer case shift lever
through N (Neutral) directly to the
desired position.
4. If the transfer case does not, or only
partially moves to the desired position,
perform a shift with the transmission
in N (Neutral) and the vehicle rolling at
a speed below 3 mph (5 km/h).
5. If shifting to 2H (2WD) with the vehicle
at a complete stop, disengage the
locking hubs (optional) by rotating the
hub lock control from LOCK to FREE.
Using the N (Neutral) position
WARNING
Do not leave the vehicle unattended
with the transfer case in the N
(Neutral) position. Always set the
parking brake fully and turn off the ignition
when leaving the vehicle.
E163189
The transfer case neutral position overrides
the transmission and puts the vehicle in
neutral regardless of transmission gearshift
lever position. The vehicle can move
forward or backwards.
This position should only be used when
towing the vehicle.
153
Super Duty (), enUSA
Four-Wheel Drive
(If Equipped)