According to the info I read on the forum, the problem I am having is a bad TCM, the fix was replacing it. I have a dronning, shuttering sensation between 20 and 30 miles per hour, the same as the other fella I read about. He had a heck of a time getting it diagnosed, and finally, after checking Mercedes and Chrysler dealers the mechanics finally figured it was the TCM. They replaced it and the problem was solved. question: is the TCM and the TCU the same component?