I have a 2005 LE Armada ( 130k miles) with a transmission problem that started a few days ago. Within a few minutes of placing it into gear I would get a thump sound from the rear and suddenly it would be hard to accelerate. It feels almost as if you were driving with the brakes on. Once you get moving it seems to be okay. My local shop checked the codes and it seems that the tranny needs to be rebuilt, something internal. In addition to the shifter not moving without using a screwdriver through the button hole to depress the safety lever I have lost interest in keeping the truck. Anyone else have this issue ???????