I was driving down the highway at 65mph when the truck shifted into Neutral. Could not shift back into drive. Pulled over 3 lanes to shoulder and stopped, shifted to Park, turned off engine. Restarted and shifted into Drive. While driving to dealer truck seized up and stopped at a red light. Could not start or shift into neutral. Left stranded in traffic hoping not to get rear ended by 65mph traffic. No warning signs, dash light notifications or check engine lights were on.