I have an automatic 2000 GMC Jimmy. It has automatic 4-Wheel Drive. After a recent snow storm, in which I was stuck, I could not get it into 4-wheel drive by selecting the automatic button, the 4-hi button, or the 4-low button. The buttons would just flash and the 4-wheel would not engage. Finally a friend pulled me out and then "bumped" me into a straigt line and the 4-low button - that we had last selected - finally engaged. Now it will not go out of 4-wheel drive. Using the same method that got me into 4-wheel drive, i have selected every button (on a dry, flat straight away) and it will not disengage.
2. Is there something manually I can do on the exterior to take it out of 4-wheel drive?
3. Outside of really using a lot of gas, what negative mechanical impacts will driving in 4-wheel drive on a dry flat road might this have on my vehicle?
4. anything i haven't asked that you might advise?