GMC 2002 Sierra - 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
transfer case into 4
- Wheel Low (4LO), or your
gears could clash.
Remember that driving in 4 - Wheel High (4HI) or
4 - Wheel Low (4LO) 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.
Automatic Transfer Case (If Equipped)
The transfer case buttons
are located to the left of the
instrument panel cluster.
Use these switches to shift into and out of
four
- wheel drive.