2000 Dodge 3500 Dually - shifting problems
My Dad has a 2000 3500 Dually with Cummins and Overdrive tranny. I'm researching this for him. The problem: The truck shifts erratically in Drive or Overdrive only between 1400 and 1600 RPMs, usually when going up a slight grade or hill, but it will do it on the level, too. In 1st or 2nd gear, there's no problem. You can watch the tach and see the needle jump back and forth, and you can feel the "lunge" or "surge" when it happens. It used to be very intermittent, sometimes not occuring for a year, but it's more frequent now. I read a post that said maybe the injector pump? Could it be electrical? Any ideas are appreciated. Thanks.