This may or may not be helpful, but Ford had a similar problem with TCs on Mustangs some years back and did a recall. You are describing a vibration. Would you say it is a "shudder" like something slipping a little? If so, you might try a trans service. This was Ford's first corrective action. I think a lot of poeple got new TC's out of that problem eventually. Just because you go back to the dealer and find others that demonstrate the same issue does not make it "normal". All cars during a particular build phase my demonstrate the problem due to a faulty part supplied by a supplier. Don't let this drop.
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