All I can say is that I had a similar problem, went to the dealer. they replaced the entire torque converter assembly... Thank god it was under waranty!!!
My problem was not as serious as yours though, I felt some slippage and a few days before going to the dealer, it started to whine... Since then, I have broblems with leaky CV-joint Boots... The car is going again to the dealer on Twesday.
Ian
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