don't know how long they kept the throttle feature but i still have it on my 50. have used it only to keep it at a higher rpm for diagnostic purposes. the truck doesn't see a lot of "granny" gear work since it's retirement.
norm84, give up the cigarettes and leave it as a throttle. you'll live longer and it will maintain it's value...by the way, how is chattanooga? been too many years since i walked the streets there. nice place and i loved the history of the area.