You will have to check everything from the shifter to the transmission to find out what may have loosened up. Several threads mention a bracket at the shifter with two T30 bolts that tend to loosen up on new Rangers I could not find anything on a 1986.
http://www.yellowbullet.com/forum/sh...d.php?t=681082
Here is a link that may help, there is a diagram about 3/4 way down the thread that may be the same or close to your truck.
I hope this helps if not perhaps someone else may pipe in.