Black plate (42,1)
GMC Sierra Owner Manual - 2012 - CRC - 11/15/11
9-42
Driving and Operating
Recommended Transfer Case Settings
Driving Conditions
Transfer Case Settings
2
m
4
m
4
n
N
Normal
YES
Severe
YES
Extreme
YES
Vehicle in Tow*
YES
*See
Recreational Vehicle Towing on page 10
‑
93
or
Towing the Vehicle on
page 10
‑
93
.
Notice:
Driving on clean, dry
pavement in four-wheel drive for
an extended period of time can
cause premature wear on the
vehicle's powertrain. Do not
drive on clean, dry pavement in
Four-Wheel Drive for extended
periods of time.
4
n
(Four-Wheel Drive Low):
This
setting also engages the front axle
and delivers extra torque. You may
never need Four-Wheel Drive Low.
It sends maximum power to all
four wheels. You might choose
Four-Wheel Drive Low if you are
driving off-road in deep sand, deep
mud, deep snow, and while climbing
or descending steep hills.
If the vehicle has StabiliTrak
®
,
shifting into Four-Wheel Drive Low
will turn Traction Control and
StabiliTrak off. See
StabiliTrak
®
System on page 9
‑
55
.
A parking brake symbol is located
next to the N (Neutral) symbol as a
reminder to set the parking brake
before shifting the transfer case into
N (Neutral).
{
WARNING
Shifting the transfer case to
N (Neutral) can cause the vehicle
to roll even if the transmission is
in P (Park). You or someone else
could be seriously injured. Be
sure to set the parking brake
(Continued)