Ford 2005 F250 Owner's Manual page 189

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.
Using the Electronic Shift On the Fly (ESOF) 4WD system
(if equipped)
Positions of the electronic shift system
The electronic shift 4WD system is designed to allow up to 45
seconds before a shift command is performed. In the event that
conflicting shift commands are selected, allow up to 45 seconds
for the shift command to be performed prior to reporting any
shift concerns to your authorized dealer.
Note: Some noise may be heard as the 4WD system shifts or engages.
This is normal.
2H (2WD High) – For general on-road driving. Sends power to the rear
wheels only.
4H (4WD High) – For winter and off-road conditions. Sends power to
front and rear wheels.
4L (4WD Low) – For low-speed off-road applications that require extra
power such as steep grades, deep sand or pulling a boat out of the water.
Sends power to front and rear wheels.
Shifting from 2WD (2WD High) to 4x4 HIGH (4WD High)
Rotate the 4WD control to the 4x4
HIGH position at speeds up to 55
mph (88 km/h).
• The electronic shift 4WD
system is designed to engage
4x4 HIGH (4WD High) when
the vehicle is moving. If
shifted to 4x4 HIGH (4WD
HIGH) while at complete stop,
4x4 may not engage and the
4x4 indicator may not
illuminate until the vehicle is allowed to move at a speed above
1 mph (1.6 km/h).
• Do not shift into 4x4 HIGH with the rear wheels slipping.
Driving
189