GMC Hummer H3 2008 Owner's Handbook Manual page 316

4. Place the jack under the jack-
ing point nearest the tyre you
want to change.
- If the flat tyre is on a front
wheel, place the jack on the
front lower control arm along
the bar that runs front-to-
back.
Section 5
- If the flat tyre is on a rear
wheel, place the jack under
the rear axle.
315 . . .