my 4 wheel drive locks in sometimes and its really scary when it locks in when i do a turn because the times screech and the car jolts violently. the only way to get it to quit for awhile is by pushing all the buttons for the 4 wheel drive and gun it on turns and that's only way i can get it to unlock. it does this almost every time i put it in reverse but when i put it in drive its doesn't do it. chevy sucks, never again will i own one