Mountain Driving Issue
Driving from St. Louis to San Diego had no problemS until I was going down the mountain from Flagstaff to Phoenix. 8% slope. I had it in drive with tow-haul button engaged. I was trying to keep a steady speed Downhill when transmission seemed to disengage and accelerator was making engine rev a lot. Pulled over and tried to change gears and it just bucked and continued to rev. Ended up having it towed to a Ford/RV dealer in Dewey AZ. They say there is nothing wrong with it. What did I do wrong? Afraid to try to drive it down to a Phoenix.
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