GMC 2011 Sierra - Manual (Page 514)

Black plate (90,1) GMC Sierra Owner Manual - 2011
10-90 Vehicle Care
Front Position - 1500 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.
Front Position - All Other Models
Position the jack under the
vehicle as shown. If the flat tire
is on the front of the vehicle (all
other models), position the jack
on the frame behind the flat tire.
Rear Position – 1500 Models
5. If the flat tire is on the rear,
for 1500 models position the
jack under the rear axle about
2 inches (5 cm) inboard of the
shock absorber bracket.