GMC 1996 Sierra Owner's Manual page 242

NOTICE:
Raising your vehicle with the jack improperly
positioned will damage the vehicle or may allow
the vehicle to fall off the jack. Be sure to fit the
jack lift head into the proper location before
raising your vehicle.
Front Position Rear Position
Front
Position
Rear
Position
3. With UP o n the ratchet facing you, raise the vehicle
by rotating
the
ratchet
and
wheel wrench clockwise.
Raise the vehicle far enough off the ground so there
is enough room for the spare tire
t o
fit.
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