1993 GMC Safari Owner's Manual - Page 231

I I I f K3536 Positionjackunderthevehicle. I 1 A Getting under a vehicle when it is jacked up is dangerous. If the vehicle slips off the jack, you could be badly injured orkilled.Never get under a vehicle when it is supported only by a jack. I will damage the nalsing your vehicle with the jack improperly positioned to fall off the jack. Be sure to fit the jack dehicleormayallowthevehicle ift head into the proper location before raising your vehicle. 5-25