1994 GMC Suburban Owner's Manual - Page 244

If You're Stuck: In Sand, Mud, or Snow Ice What you don't want to do when your vehicle is stuck is tospin your wheels. The method known as "rocking" can help you get outwhen you're stuck, but you must usecaution. NOTICE: Spinning your wheels can destroy parts your vehicle as well as of the tires. If you spin the wheels too fast while shifting your transmission back and forth, you can destroy your transmission. Rocking your vehicle to getout: it First, turn your steering wheel left and right. That will clear the area around your front wheels. Then shift back and forth between "R' (Reverse) and a forward gear (or with a manual transmission, between First orSecond gear and Reverse), spinning the wheels as little as possible. Release the accelerator pedal while you shift, and press lightly on the accelerator pedal when the transmission is in gear. If that doesn't get you out after afew tries, you may need to be towed out. Or, you can use your recoveryhooks, if your towed out, see"Towing Your vehicle has them. If you do need to be Vehicle" in the Index.