I have a 1997 Expedition Eddie XLT. The 4x4 was working great the last time I used it 2 weeks ago. The only thing I did to the truck was changed out the two front tires at the same time by lifting up the front end. When I put it in N it will go in to AWD just fine, but when I try to go to 4L or 4H it makes a clicking noise in the knob. and nothing happens? If anyone has any ideas I thank you.