[Rory McNeil]

Quite a few years ago, my buddys 3500 454 Dually (I believe that it was also a 98 model) did the same thing,he took it to a transmission shop, and they couldn`t find anything wrong with the transmission itself. Not sure how they figured it out, but indeed, the problem was a bad ignition switch. He replaced the switch, and drove the truck another 10 years or so, until it was written off in an accident, but never did have any transmission problems with it.