GMC 2010 Sierra - Manual (Page 568)

3. Use the wheel wrench and turn it counterclockwise
to loosen the wheel nuts. Do not remove the wheel
nuts yet.
Front Position - 1500
Models
Front Position - All Other
Models
4. Position the jack under the vehicle as shown. If the
flat tire is on the front of the vehicle (1500 Model
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.
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