FORD 2000 Expedition - Manual (Page 4)

drive over terrain and road
conditions that a conventional
two-wheel drive vehicle can’t.
Power is supplied to all four
wheels through a transfer case. On
4WD vehicles the transfer case
allows you to select 4WD when
necessary. Information on transfer
case operation, shifting procedures
and maintenance can be found in
your “Owner’s Guide.” You should
become thoroughly familiar with
this information before you operate
your vehicle.
Normal characteristics
• On some 4WD models, the initial
shift from two-wheel drive to
4x4 while the vehicle is moving
can cause some momentary
clunk and ratcheting sounds.
This is the front drivetrain
coming up to speed and the
automatic locking hubs engaging
and is not cause for concern.
• On some 4WD models, if the
vehicle is stopped while in 4WD
and the vehicle direction is
reversed from the previous
direction, the automatic locking
hubs will momentarily disengage
and re-engage. The automatic
locking hubs may click as they
automatically engage in the new
direction.
4WD and AWD systems
4