1997 GMC Suburban Owner's Manual - Page 269

I A CAUTION: Getting under a vehicle when it is jacked up is dangerous. If the vehicle slips off the jack,you could be badly injured r killed. Never get under o a vehicle when it issupported only by a jack. I Front Position Rear Position 3. Position the jack under the vehicle. If the flat tire is on the front of the vehicle, position the jack on the frame behind the flat tire. If the flat tire is on the rear of the vehicle, position the jack on the axle near the flat tire between the spring and the shock absorber. I NOTICE: Raising yourvehicle with the 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. 5-29