Chevrolet Avalanche Owner's Manual page 420

Jack Positions (Overall View)
Refer to the above graphic which shows the general
area of jack placement, front position (A), and
rear position (B). See the text and art following for
the exact jack placement.
CAUTION:
{
Getting under a vehicle when it is jacked up is
dangerous. If the vehicle slips off the jack you
could be badly injured or killed. Never get
under a vehicle when it is supported only
by a jack.
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CAUTION:
{
Raising your vehicle with the jack improperly
positioned can damage the vehicle and even
make the vehicle fall. To help avoid personal
injury and vehicle damage, be sure to fit the
jack lift head into the proper location before
raising the vehicle.
3. Position the jack under the vehicle.