1995 GMC Sonoma Owner's Manual - Page 212

Getting under a vehicle whenit is jacked up is dangerous.If the vehicle slips off the jack, you could be badly injured or killed. Never getunder a vehicle whenit is supported only by a jack. NOTICE: Raising your vehicle withthe 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. I Raise the vehicle by turning the jackhandle clockwise. Raise the vehicle far enough off the ground so there is enough room for the spare tire to fit. Remove all the wheel nuts. 5-28