GMC 2010 T-Series Owner's Manual page 144

Towing the Vehicle with the Front Bumper
Removed
1. Remove the front bumper.
2. Connect and lock the lift chains to the front axle,
outside of the spring anchor plates as shown.
3. Connect the lift chains to the tow bar and raise the
tow bar until lift chain slack has been taken up.
4. Raise the vehicle to the required height.
4-22
Rear Axle
1. Disconnect the propshaft at the rear axle.
2. Secure the propshaft to the frame or the
crossmember.
After Towing
1. Block the rear wheels and install the propshafts.
2. Check for proper phasing of universal joints.
3. Apply the emergency brake system before
disconnecting from the towing vehicle.
4. Check and fill the rear axle with oil as required.
Towing Your Vehicle From the Rear
(Rear Wheels Off the Ground)
Before Towing
Secure the steering wheel to maintain a straight-ahead
position. Make certain that the front axle is not loaded
above the front axle Gross Axle Weight Rating (GAWR)
as indicated on the vehicle's Certification Label. See
Loading the Vehicle on page 4 18 for more information.