My 97` f`150 will not engage 4x4 when I throw the manual shift, light comes on and drive shaft does turn. From what I have read so far it seems like it could be a vacuum type switch or line that engages some gears in the pumpkin.Can someone please explain alittle further how this works on 97`. I would like to see if I could fix ,myself if its a line or switch.
Thanks
Rick