Electronic Transfer Case; Automatic Transfer Case - GMC 2010 Sierra Owner's Manual

Electronic Transfer Case

This transfer case knob is located next to the steering
column.
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Automatic Transfer Case

This transfer case knob is located next to the steering
column.
Each transfer case design offers different drive options.
The list below described the different drive options that
may be available.
2 (Two-Wheel-Drive High): This setting is used for
driving in most street and highway situations.