Chevrolet Tahoe 2015 Owner's Manual page 24

Transmission
Range Selection Mode
The Range Selection Mode switch,
if equipped, is on the shift lever.
1. To enable the Range Selection
feature, move the shift lever to
the M (Manual) position. The
current range will appear next to
the M. This is the highest
attainable range with all lower
gears accessible. As an
example, when 5 (Fifth) gear is
selected, 1 (First) through
5 (Fifth) gears are available.
2. Press the plus/minus buttons on
the shift lever to select the
desired range of gears for
current driving conditions. See
Manual Mode on page 9-34.
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.
Four-Wheel Drive
If the vehicle has four-wheel drive,
you can send the engine's driving
power to all four wheels for extra
traction.
In Brief
Automatic Transfer Case
Two Speed Automatic
Transfer Case
1-17