GMC 2006 Sierra - Manual (Page 136)

Automatic Transfer Case
The transfer case buttons
are located to the left of the
instrument panel cluster.
Use these switches to shift into and out of
four-wheel drive.
Recommended Transfer Case Settings
Driving
Conditions
Transfer Case Settings
2
m
AUTO
4WD
4
m
4
n N
Normal YES
Variable YES
Severe YES
Extreme YES
Vehicle in
Tow*
YES
*See Recreational Vehicle Towing on page 4-62 for
further information.
You can choose among four driving settings:
Notice: Driving on clean, dry pavement in
Four-Wheel-Drive High or Four-Wheel-Drive Low for
an extended period of time may cause premature
wear on your vehicle’s powertrain. Do not drive on
clean, dry pavement in Four-Wheel Drive High or
Four-Wheel-Drive Low for extended periods of time.
AUTO 4WD (Automatic Four-Wheel Drive): This
setting is ideal for use when road surface traction
conditions are variable. When driving your vehicle in
Automatic Four-Wheel Drive, the front axle is engaged,
but the vehicle’s power is sent to the rear wheels.
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