Global Machinery Company Sierra 1999 - Manual (Page 101)

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CAUTION:
Shifting the transfer case to NEUTRAL (N) can
cause your vehicle to roll even if the transmission
is in PARK (P), or if you have a manual
transmission, even if you are in gear. You or
someone else could be seriously injured. Be sure
to set the parking brake before placing the
transfer case in NEUTRAL (N). See “Parking
Brake” in the Index.
NEUTRAL (N): Shift to this setting only when your
vehicle needs to be towed. The ignition switch must be
in the RUN position in order to shift the lever into
NEUTRAL (N). See “Recreational Vehicle
Towing”or“Towing your vehicle”in the Index.
4 - Wheel Low (4L): This setting also engages your
front axle and delivers extra torque. You may never need
4LO. It sends maximum power to all four wheels. You
might choose 4LO if you are driving off
- road in deep
sand, deep mud, deep snow and climbing or descending
steep hills.
You can shift from 2 - Wheel High (2H) to 4 - Wheel High
(4H) or from 4 - Wheel High (4H) to 2 - Wheel High (2H)
while the vehicle is moving. Your front axle will engage
faster if you take your foot off of the accelerator for a
couple of seconds after you shift. In extremely cold
weather, it may be necessary to stop or slow the vehicle
to shift into 4
- Wheel High (4H).
To shift into or out of 4 - Wheel Low (4L) or
NEUTRAL (N):
1. Slow the vehicle to a roll, about 1 to 3 mph
(2 to 5 km/h) and shift an automatic transmission
into NEUTRAL (N), or with a manual transmission,
press the clutch pedal.
2. Shift the transfer case shift lever in one
continuous motion.
Don’t pause in NEUTRAL (N) as you shift the transfer
case into 4
- Wheel Low (4L), or your gears could clash.
Remember that driving in 4 - Wheel High (4H) or
4 - Wheel Low (4L) may reduce fuel economy. Also,
driving in four - wheel drive on dry pavement could
cause your tires to wear faster and make your transfer
case harder to shift and run noisier.