chuck the linkage goes to a transfer in the engine compartment then down to the sode of the trans. the arm on the side of the trans is held in place by a set screw or a jam nut. if it was working ok them it went soft and does nothing i would have a person move the shifter with the engine OFF through its pattern and watch at every point for the part it is spinning on. I would expect it to be at the trans at 1st guess but i have seen the pivot juction come appart too.