1997 GMC Sonoma Owner's Manual - Page 227

Getting undera vehicle when it is jacked upis dangerous. If the vehicle slips the jack,you off could be badly injuredor killed. Never get under a vehicle when it is supported only by a jack. NOTICE: 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 your vehicle. 4. Raise the vehicle by turning the jack handle clockwise. Raise the vehicle far enough off the ground so there is enough room for the spare tire to fit. 5. Remove all the wheel nuts and take off the flat tire.