1996 GMC Safari Owner's Manual - Page 223

Getting undera vehicle when it is jacked upis dangerous. If the vehicle slipsoff the jack,you could be badly injured killed. Never getunder or a vehicle when it is supported onlyby a jack. I NOTICE: Raising your vehicle with the jack improperly positioned will damage thevehicle or may allow the vehicle to falloff the jack.Be sure to fit the jack lift head into the proper location before raising yourvehicle. 7. Raise the vehicle by rotating the ratchet clockwise. Make sure the UP mark faces you. Raise thevehicle far enough off the ground so there is enough room for the spare tire to fit. 8. Remove all the wheel nuts and take off the flat tire. Do not jack up the vehicle with people in or near the vehicle. 5-31