GMC TopKick 2007 Owner's Manual page 118

An indicator light shows you which position the
transfer case is in. The indicator lights come on
briefly when you turn on the ignition and one stays
on. If the lights do not come on, you should take
your vehicle to your dealer for service. An indicator
light flashes while shifting the transfer case. It will
remain on when the shift is complete. If for some
reason the transfer case cannot make a requested
shift, it returns to the last chosen setting.
118
If your vehicle has
four-wheel drive, the
transfer case knob
is located to the right of
the steering wheel
on the instrument panel.
Use this knob to shift
into and out of
four-wheel drive.
Recommended Transfer Case Settings
Driving Conditions
Normal
Severe
Extreme
Vehicle in Tow*
*See Towing Your Vehicle on page 237 for further
information.
m
2 (Two-Wheel High): This setting is for driving
in most street and highway situations. The
transfer case does not drive the front axle in
two-wheel drive. The front-axle spins if the front
wheel hubs are locked. Be sure to unlock the hubs
to achieve the best fuel economy.
m
4 (Four-Wheel High): Use Four-Wheel High
when you need extra traction, such as on snowy or
icy roads or in most off-road situations. Be sure
the front wheel hubs are locked when you want to
drive in Four-Wheel High.
Transfer Case Settings
m m n
2 4 4
YES
YES
YES
N
YES