GMC 2012 Sierra Series Owner's Manual page 499

Two-wheel-drive vehicles should not
be towed with the rear wheels on
the ground. Two-wheel-drive
transmissions have no provisions
for internal lubrication while being
towed.
To dolly tow a two wheel drive
vehicle, the vehicle must be towed
with the rear wheels on the dolly.
See Rear Towing (Rear Wheels Off
the Ground) later in this section for
more information.
Front Towing (Front Wheels Off
the Ground) Four-Wheel-Drive
Vehicles
Use the following procedure to dolly
tow a four-wheel-drive vehicle from
the front:
1. Attach the dolly to the tow
vehicle following the dolly
manufacturer's instructions.
2. Drive the front wheels onto the
dolly.
I n f o r ma t i o n P r o v i d e d b y :
Vehicle Care
3. Shift the transmission to
P (Park).
4. Firmly set the parking brake.
WARNING
Shifting a four-wheel-drive
vehicle's transfer case into
N (Neutral) can cause the vehicle
to roll even if the transmission is
in P (Park). The driver or others
could be injured. Make sure the
parking brake is firmly set before
the transfer case is shifted to
N (Neutral).
5. Use an adequate clamping
device designed for towing to
ensure that the front wheels are
locked into the straight position.
6. Secure the vehicle to the dolly
following the manufacturer's
instructions.
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