GMC 2015 Sierra Owner's Manual page 303

9-40 Driving and Operating
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
before placing the transfer case in
N (Neutral). See Parking Brake on
page 9-48.
Caution
Extended high-speed operation in
4 may damage or shorten the
life of the drivetrain.
Engagement noise and bump when
shifting between 4 and 4 or from
N (Neutral), with the engine running,
is normal.
Shifting into 4 will turn Traction
®
Control and StabiliTrak
Traction Control/Electronic Stability
Control on page 9-50.
Manual Transfer Case
Move the lever to shift into and out
of four-wheel drive.
An indicator light comes on when
four-wheel drive is engaged. See
off. See
Four-Wheel-Drive Light on
page 5-25.
N (Neutral): Use only when the
vehicle needs to be towed. See
Recreational Vehicle Towing on
page 10-94 or Towing the Vehicle
on page 10-94.
2 (Two-Wheel Drive High): Use
this setting for driving on most
streets and highways. The front axle
is not engaged. This setting
provides the best fuel economy.
4 (Four-Wheel Drive Low): This
setting also engages the front axle
and delivers extra torque. Choose
4 if driving off-road in deep sand,
deep mud, or deep snow, and while
climbing or descending steep hills.
When engaged, keep vehicle speed
below 72 km/h (45 mph).
4 (Four-Wheel Drive High): Use
this setting when extra traction is
needed. The front axle engages and