1998 GMC Jimmy auto transmission with 3 button push for 4 WD. 4.3
> engine. I was in 4WD and went to go out but it did not shift and went
> to what I would call N. I had no power to any wheel. I put it in park
> and hear a slight grinding and it when into 4WD. I managed to get it
> home but it was like it popped out of drive and back to N and no power > to the wheels.
>
> I changed the ball looking vac switch on top or the trasnsfer switch
> but still have the problem. It will not shift into 4WD then it went to
> no power again. I put it P and after playing with the buttons it went > back to 2WD.
>
> Any ideas?
I had the '95 4WD SLE.
AFAIR, your vacumn actuator is shot. You need to check that.