My wife dorve the truck this morning. She said it was reving up 3300 rpm (40 mph) without a shift. Limp mode in other words. She reported a similar problem months ago. I drive the truck 99% of the time and have never had this problem. I was wracking my brain trying to come up with an explanation. She thought perhaps she was missing some anatomy that the truck prefered... It struck me that I use the original key and she uses a hardware store remake. Is there any way a poor fitting key could set the truck in limp mode? Tomorrow morning I will start the truck cold with her key and see what happens. Any thoughts??