GMC yukon-2000 User Manual

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To rock your vehicle back and forth to get out of snow,
ice or sand without damaging your transmission, see
“Stuck: In Sand, Mud, Ice or Snow” in the Index.
NEUTRAL (N): In this position, your engine doesn’t
connect with the wheels. To restart when you’re already
 moving, use NEUTRAL (N) only. Also, use NEUTRAL (N)
when your two
-
wheel drive vehicle is being towed.
CAUTION:
Shifting out of PARK (P) or 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 PARK (P) or
NEUTRAL (N) while your engine is racing.
NOTICE:
Damage to your transmission caused by shifting
out of PARK (P) or NEUTRAL (N) with the
engine racing isn’t covered by your warranty.
DRIVE (D): This position is for normal driving. If you
need more power for passing, and you’re:
D Going less than about 35 mph (56 km/h), push your
accelerator pedal about halfway down.
D Going about 35 mph (56 km/h) or more, push the
accelerator all the way down.
You’ll shift down to the next gear and have more power.
DRIVE (D) can be used when towing a trailer, carrying
a heavy load, driving on steep hills or for off
-
road
driving. You may want to shift the transmission to
THIRD (3) or, if necessary, a lower gear selection if 
the transmission shifts too often.