I was highway driving @ 55 mph when the trans acted like I shifted to neutral, the only gear that works now is Park
Engine starts & runs fine, no other problems. No trouble lights. We had it towed
home and here it sits. The mileage is 110K. The transmission has been serviced
regularly. The fluid looks good, no burnt smell & no grainy texture or other evidence of
metal grindings. Any idea as to a switch that may be out that I could replace or does
this need to go to a dealer.