One of my friends has a 89 cherokee that has decided to not shift any more. After he ran it in some deeper water his rig started freaking out including the tranny. Told him to check it. he did. Also put in a wiring harness he knows is good in it. Fixed his horn and dash panel problem but even with a good computer he's still not shifting. Idk what to tell him.....Anybody got any ideas I can give him please!