GMC Sierra 2000 Owner's Manual page 92

NEUTRAL (N): Shift to this setting only when
your vehicle needs to be towed or when using a
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power 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.
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
-
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.
2-24
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WHEEL HIGH (4H)
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WHEEL HIGH (4H).
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
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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, turn
the thumbwheel located next to the headlamp switch
up to brighten or down to dim your transfer case
indicator light.
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WHEEL HIGH (4H) or