1994 GMC Suburban Owner's Manual - Page 237

A CAUTION: Getting undera vehicle when it jacked upis dangerous. If the is vehicle slips off the jack,you could bebadly injured or killed. Never get under vehicle when it supported onlyby a jack. a is NOTICE: Raising damage Be sure raising your vehicle with the jack improperly positioned will the vehicle mayallow thevehicle to fall off the jack. or to fit the jack lift head into the proper location before yourvehicle. Front Position Rear Position Raise the vehicle by rotating the ratchet to the right. Make sure the UP marking faces you. Use the jack handle extentions if the flat is on the rear of the vehicle. Raise the vehicle far enough off the ground so there is enough room for the spare tire to fit. 5-33