Chevrolet 2006 Colorado Owner's Manual page 258

Four-Wheel Drive Vehicles
Use the following procedure to tow your vehicle with all
four wheels on the ground:
1. Drive the vehicle to be towed into position behind
the tow vehicle.
2. Firmly set the parking brake. See Parking Brake on
page 2-28 for more information.
3. Put an automatic transmission in PARK (P) or a
manual transmission in FIRST (1).
4. Securely attach the vehicle being towed to the
tow vehicle.
4-52
CAUTION:
{
Shifting a four-wheel-drive vehicle's transfer
case into NEUTRAL can cause your vehicle to
roll even if the transmission is in PARK (P) for
an automatic transmission, or if your vehicle is
in gear, for a manual transmission. You or
others could be injured. Make sure the parking
brake is firmly set before you shift the transfer
case to NEUTRAL.
5. Shift the transfer case to NEUTRAL. See
Four-Wheel Drive on page 2-24 for more
information.
6. Release the parking brake only after the vehicle
being towed is firmly attached to the tow vehicle.
7. Turn the ignition to LOCK.
If the tow vehicle will not be started or driven for
six weeks or more, remove the battery cable
from the negative terminal (post) of the battery to
prevent your battery from draining while towing.
After towing see "Shifting Out of NEUTRAL" under
Four-Wheel Drive on page 2-24.