Ford 2003 Excursion Owner's Manual page 168

Driving
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 cond 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.
Note: Some noise may be heard as the 4WD system shifts or engages.
This is normal.
Shifting from 2WD (2WD High) to 4x4 HIGH (4WD High)
Rotate the 4WD control to the 4x4
HIGH position at speeds up to 88
km/h (55 mph).
• To prevent damage, 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 driven above 8 km/h (5
mph).
Do not shift into 4x4 HIGH with the rear wheels slipping.
Shifting from 4x4 HIGH (4WD High) to 2WD (2WD High)
Rotate the 4WD control to 2WD at
any forward speed. Disengagement
of the transfer case and front hubs
may be delayed due to torque bind
which is caused by driving on dry
hard surfaces or performing tight
turns while using the 4WD system.
• You do not need to operate the vehicle in R (Reverse) to disengage
your front hubs, but it will eliminate any torque bind and allow the
system to immediately disengage.
168
4X4
4X4
HIGH
LOW
2WD
4X4
4X4
HIGH
LOW
2WD