GMC 2006 Sierra - Manual (Page 510)

2. Use the wheel wrench and turn it counterclockwise
to loosen the wheel nuts. Do not remove the wheel
nuts yet.
A. Front Location (Two-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.
Jacking Locations
5-98