I picked up a black 06 charger r/t two weeks ago. After putting 300 miles on it, the computer for the trasmission locked out my auto stick and "defaulted" the auto trans into second gear, which only allowed me to drive up to 40 mph. I was told at the service dept. that the computer goes into this "default" mode when the computer senses a problem in the transmission in order to prevent excessive revving. Since that time, the Service Dept. was not able to initially diagnose the problem and had to talk to the Chrysler techs. They replaced some type of module in the computer, but that didn't fix the problem. Now they are waiting on some type of a laminated circuit board, which may or may not fix the problem. Has anyone else had a similar problem? Please advise.