GMC Envoy XL 2003 Owner's Manual page 97

Shifting Out of 4LO
To shift from 4LO to 4HI, A4WD or 2HI your vehicle
must be stopped or moving less than 2 mph (3.2 km/h)
with the transmission in NEUTRAL (N) and the
engine running. The preferred method for shifting out
of 4LO is to have your vehicle moving
(1.6 to 3.2 km/h). Turn the knob to 4HI, A4WD or 2HI.
You must wait for the 4HI, A4WD or 2HI indicator light to
stop flashing and remain illuminated before shifting
your transmission into gear.
If the 4HI, A4WD or 2HI knob is turned when your
vehicle is in gear and/or moving, the 4HI, A4WD or
2HI indicator light will flash for 30 seconds but will
not complete the shift unless your vehicle is moving
less than 2 mph (3.2 km/h) with the transmission
in NEUTRAL (N).
Shifting into NEUTRAL
Before shifting the transfer case to NEUTRAL, first
make sure the vehicle is parked so that it will not roll.
1. Set the parking brake.
2. Start the vehicle.
3. Connect the vehicle to the towing vehicle.
4. Put the transmission in NEUTRAL (N).
5. Shift the transfer case to 2HI.
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or 2 mph
1
6. Turn the transfer case knob all of the way past 4LO
and hold it there for a minimum of 10 seconds. The
neutral indicator light will come on.
7. Shift the transmission to REVERSE (R) for one
second, then shift the transmission
for one second.
8. Place the transmission shift lever in PARK (P).
9. Turn the ignition to LOCK.
10. Release the parking brake prior to towing.
Shifting Out of NEUTRAL
To shift the transfer case out of NEUTRAL, do the
following:
1. Set the parking brake and apply the regular brake
pedal.
2. Start the vehicle with the transmission in PARK (P).
3. Turn the transfer case knob to the desired shift
position (2HI, 4HI or A4WD).
4. Put the transmission in NEUTRAL (N).
5. After the transfer case has shifted out of NEUTRAL,
the indicator light will go out. Shift the transmission
lever to the desired position.
A re-engagement sound is normal when shifting out of
NEUTRAL.
to DRIVE (D)