GMC SIERRA 2002 Manual page 129

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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
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transfer 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.
2-48
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Wheel High (4HI) or
Automatic Transfer Case (If Equipped)
Use these switches to shift into and out of
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four wheel drive.
The transfer case buttons
are located to the left of the
instrument panel cluster.