Chevrolet 2000 Tahoe Owner's Manual page 99

Automatic Transfer Case (If Equipped)
Use these switches to shift into and out of
-
four wheel drive.
The transfer case switches
are located to the left of the
instrument panel cluster.
You can choose among four driving settings:
2HI: This setting is used for driving in most street and
highway situations. Your front axle is not engaged in
-
two wheel drive. This setting also provides the best
fuel economy.
2-23