GMC SIERRA CK2 1999 Owner's Manual page 101

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4 Wheel High (4H): This setting engages your front
axle to help drive your vehicle. Use 4H when you need
extra traction and in most off
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 or when using a power
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take off.
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4 Wheel Low (4L): This setting also engages your
front axle to give you extra power and also gives you a
higher driveline ratio. It should be used only for
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off road driving.
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You can shift from 2 WHEEL HIGH (2H) to
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4 WHEEL HIGH (4H) or from 4
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to 2 WHEEL HIGH (2H) while the vehicle is moving.
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road situations.
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WHEEL HIGH (4H)
Your front axle will engage faster if you take your foot
off the accelerator for a few seconds after you shift. In
extremely cold weather, it may be necessary to stop or
slow the vehicle to shift into 4
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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
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case into 4 WHEEL LOW (4L), or your gears
could clash.
Remember that driving in 4
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4 WHEEL LOW (4L) may reduce fuel economy. Also,
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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.
When your headlamps or parking lamps are on, rotate the
thumb wheel next to the headlamp switch up to brighten
or down to dim your transfer case indicator light.
yellowblue
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WHEEL HIGH (4H).
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WHEEL HIGH (4H) or
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