GMC 2014 Yukon/Yukon XL Owner's Manual page 421

After towing, see Shifting Out of
Neutral under
or
proper procedure to take the vehicle
out of the Neutral position.
for the
Two-wheel-drive vehicles and
four-wheel drive vehicles with a
single speed automatic transfer
case should not be towed with the
rear wheels on the ground.
Two-wheel-drive transmissions have
no provisions for internal lubrication
while being towed. Four-wheel drive
vehicles with a single speed
automatic transfer case have no
neutral position and will spin the
transmission when the rear
wheels turn.
To dolly tow a two-wheel-drive
vehicle or a four-wheel drive vehicle
with a single speed automatic
transfer case, 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.
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.