Electronic Transfer Case; Shifting From 2Hi To 4Hi - GMC 1997 Suburban Owner's Manual

Electronic Transfer Case (If Equipped)
4HI:
This setting engages your front axle to help drive
your vehicle. Use 4HI when you need extra traction,
such as on snowy or icy roads, or in most
off-road situations.
4LO:
This setting also engages your front axle to give
you extra traction. You may never need 4LO. It sends
the maximum power to all four wheels. You might
choose 4LO if you were driving off-road in sand, mud
or deep snow and climbing or descending steep hills.
Indicator lights in the switches show you which setting
you are in. The indicator lights will come on briefly
when you turn on the ignition and the last chosen setting
If your four-wheel-drive vehicle has the electronic
transfer case, the transfer case switches are below and to
the left of the climate controls.
Use these switches to shift into and out of four-wheel
drive. You can choose among three driving settings:
2HI: This setting is for driving in most street and
highway situations. Your front axle is not engaged in
two-wheel drive.
shift is completed. If for some reason the transfer case
cannot make a requested shift, it will return to the last
chosen setting.
Shifting from 2HI to 4HI
Press and release the 4HI switch. This can be done at any
speed, and the indicator light will flash while shifting. It
will remain illuminated when the shift is completed.
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