1999 GMC Sierra 1500 Pickup Owner's Manual - Page 275

If You're Stuck: In Sand, Mud, Ice or Snow Whatyou don't want to do whenyour vehicle isstuck is to spinyour wheels.Themethodknownas"rocking"canhelpyougetoutwhenyou're stuck,butyoumustusecaution. CAUTION - If youletyour tires spinat high speed,theycanexplodeandyou or , others could beinjured.And,thetransmission or other parts of the A vehiclecanoverheat.That could causeanenginecompartmentfire or otherdamage.Whenyou'restuck,spinthewheels as little as 35 mph (55 krnlh) as shown possible. Don't spinthewheelsabove I speedometer. the on I * NOTICE 1 ;pinning your wheels can destroy parts of your vehicle as well as the res. If you spin the wheels too fast while shifting your transmission back .nd forth, you can destroy your transmission. Rocking your vehicle to get it out: First, turn yoursteeringwheelleftandright.Thatwillclearthe area around your front wheels. Thenshiftbackand forth between R andaforward gear (or withamanualtransmission,betweenFirst or SecondgearandReverse), spinningthewheels as little aspossible.Releasetheacceleratorpedalwhile youshift,andpress lightly ontheacceleratorpedalwhenthetransmissionis a few tries,you may need to be in gear. If that doesn'tgetyououtafter if yourvehiclehas them. If towedout. Or, youcanuseyourrecoveryhooks, you do need to betowedout,see "TowingYourVehicle" in theIndex. 5-33