Just purchased a 07 Commander Limited Hemi, w quad drive 2, with 50K on it a couple months ago from a dealer out here in Medina Ohio. Took it on a test drive,(mostly on the highway) loved it and bought it. First time I drove it to work I noticed the shudder / bucking @ low RPM's, light pedal, moderate inclines. Dead spot when trying to accelerate lightly. Drove it a few more times to make sure I wasn't crazy, then took it back to the dealer. Dealer of course said they didn't feel anything but loaded the updated shift points. Now it winds out 2nd until 50+ mph @ approx 2500+ rpm, but still wont downshift out of 4th until about 30 mph under 1000 rpm. Shudder is driving me crazy, and these things aint cheap. Started looking online for info and found this site. Going to take it back to the dealer loaded with some info this time... great site. Can't believe how many folks have this problem. Looks like there might be some help coming up this month from what I've read. Will keep watching the posts. Shame we have to go through this. Glad to be aboard...