4 wheel drive on 1997 GMC Yukon

4-wheel drive is engaged all time for without it,no gears will engage? mechanic says it has to do with transfer caase but he isnt too sure and I am not a mechanic

Asked by for the 1997 GMC Yukon
Get s second opinion. Your vehicle has a 'multiple choice' push-button four-wheel-drive system. Make sure the selector is in the '2WD' position first. If the switch/button is stuck, or if the vehicle is handling/driving wierd (especially when turning), or if any service/warning lights are on, get your car to a reputable shop for service.