GMC 1997 Safari Owner's Manual page 247

4. Attach the ratchet to the extension with the UP side
facing you.
lift
head a little.
5. Rotate the ratchet to the right. That will raise the jack
6.5"
_C1
k--I
2.0"
(16.5
cm) (30.0
cm)
6. Position the jack under the vehicle.
I
a
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.