GM Chevrolet Avalanche - Manual (Page 418)

These locations (A) front position (B), rear position
are the general area of jack placement. See
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.
{ 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.
Jack positions (overall view)
5-84