Chevrolet Tahoe 2012 Owner's Manual page 26

2. Press the plus/minus buttons,
located on the steering column
shift lever, to select the desired
range of gears for current driving
conditions. See Manual Mode on
page 9 35.
While using Range Selection Mode,
cruise control and the Tow/Haul
mode can be used.
Grade Braking is not available when
Range Selection Mode is active.
See Tow/Haul Mode on page 9 36.
If the vehicle has Four-Wheel Drive,
you can send the engine's driving
power to all four wheels for extra
traction.
The transfer case knob is located to
the left of the instrument panel
cluster. Use this knob to shift into
and out of the different Four-Wheel
Drive modes.
This setting is used for driving
in most street and highway
situations.
This setting is ideal for use
when road surface traction
conditions are variable.