1997 GMC Suburban Owner's Manual - Page 279

If You're Stuck: In Sand, Mud, Ice or Snow What you don't want to do when your vehicle is stuck is to spin your wheels too fast. Themethod known as "rocking" can help you get out when you're stuck,but you must use caution. NOTICE: Spinning your wheels can destroy parts of your vehicle as well as the tires.If you spin the wheels too fastwhile shifting your transmission back and forth,you can destroy your transmission. For information about using tire chains on your vehicle, see "Tire Chains" in the Index. If you let your tires spin at high speed, they can explode, and you or others could be injured. And, the transmission or other parts the of vehicle can overheat. That could cause an engine compartment fire or other damage. When you're stuck, spin the wheels as little as possible. Don't spin the wheels above mph (55 km/h) as shown 35 on the speedometer. 5-39