I suspect my transmission shudder problem is the water problem, took it to the dealer. Even discussed the TSB, which curiously got a question of "how did you learn about TSBs?" Their result was, no problem found, monitored with computer during test drive and shift points were correct (??). At least they did perform the loud console 'pop' TSB and replaced the CD player that ate 6 CDs, though I'm still waiting for them to mail back the CDs three weeks later.
I told them I'd be back if they hadn't done anything to resolve the trans problem. It was much better for about two weeks. I wonder if they just replaced the fluid or added something to it. Oh well, with years left on the powertrain warranty if it is a water problem they'll be fixing it eventually. If they are stupid enough to wait until it needs a torque convertor replacement, Chrysler will be the ones paying for their stupidity.
By the way: I retired from the forums for awhile because it seemed any negative comments about the 300C were shouted down in the early days by people who one would think must be sleeping with, er, in their cars. Now that others are experiencing problems too, it is nice to see a more helpful than negative approach to reported problems most of the time.