GMC 2001 Sierra 1500 Pickup Owner's Manual page 119

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You can shift from 2 Wheel High (2HI) to
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4 Wheel High (4HI) or from 4
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2 Wheel High (2HI) 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
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To shift into or out of 4 Wheel Low (4LO)
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 (4LO), or your gears could clash.
Remember that driving in 4
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4 Wheel Low (4LO) 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.
2-36
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Wheel High (4HI) to
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Wheel High (4HI).
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Wheel High (4HI) or
Automatic Transfer Case (If Equipped)
Use these switches to shift into and out of four
The transfer case switches
are located to the left of the
instrument panel cluster.
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wheel drive.