[Wally Arntzen]

Yours is the same as my 88. If you go under the coach and look at right side of the transmission there is a small piston that is part of the air switch that shifts it in and out of the different shift modes. You can manually move it from one mode to the other with no problem. Have somewone watch the shift locater at your shift handle and they will know when you get into the mode that you want. I worked on mine with my mechanic friend when he rebuilt the air switch and he showed me how to do it. For anyone else with this setup it is also good to spray some lubricant on thes piston once in a while especially in hot dry climates or in the north when driving on salty roads in the winter. Mine stuck once in Arizona and I called my friend and knew just what it was and told me crawl under and spray with a lubricant and it did the job. Let us know if this solves your problem.