Chevrolet 2003 Silverado Owner's Manual page 466

2. Use the wheel wrench to loosen all the wheel nuts.
Turn the wheel wrench counterclockwise to loosen
the wheel nuts. Don't remove the wheel nuts yet.
Notice: If your vehicle is equipped with
QUADRASTEER™ avoid contact with tie rods and
tie rod boots when jacking the vehicle.
5-86
Jacking Locations
A. Front Location (2-Wheel Drive 1500 Series)
B. Front Location (All Other Series)
C. Rear Location (All Series)
3. Position the jack under the vehicle as shown. If the
flat tire is on the front of the vehicle (Two-Wheel
Drive 1500 Series vehicles), position the jack under
the bracket attached to the vehicle's frame,
behind the flat tire. If the flat tire is on the front of
the vehicle (all other models), position the jack
on the frame behind the flat tire.
If the flat tire is on the rear, position the jack under
the rear axle between the spring anchor and the
shock absorber bracket.