Automatic Transmission Operation - GMC T-Series 1999 Owner's Manual

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The light in the switch will be illuminated whenever the
switch is in the "dumped" position.

Automatic Transmission Operation

We build vehicles with four, five and six
automatic transmissions. This part of the manual covers
the basics of these. With some of the transmissions, you
will find another manual in your vehicle that goes into
more detail. On the ceiling, in front of and above the
driver, or in some other place near the driver, you will
see a label that describes important operating facts about
the automatic transmission in your vehicle. Make sure
you follow the instructions on this label.
The switch to deflate and
inflate the air suspension is
located on the instrument
panel to the right of the
comfort controls.
-
speed
CAUTION:
It can be dangerous to get out of your vehicle
without the parking brake firmly set. Your
vehicle can roll. If you've left the engine running,
the vehicle can move suddenly. You or others
could be injured. To be sure your vehicle won't
move, even when you're on fairly level ground,
always set your parking brake.
CAUTION:
Shifting out of NEUTRAL (N) while your engine
is "racing" (running at high speed) is dangerous.
Unless your foot is firmly on the brake pedal,
your vehicle could move very rapidly. You could
lose control and hit people or objects. Don't shift
out of NEUTRAL (N) while your engine is racing.
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