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MD350 - I had my vehicle looked at for the trans whine about 2-3 months ago. My tech confirmed it was there after an extensive road test, but we never reached a conclusion on it. At the time he did mention replacing the trans, but was reluctant to do so in case this didn't solve the issue. I didn't pursue it as we had other things to discuss with the trans. I found the whine mainly around 2000-2500rpm in 1-3rd gears. My car didn't do this initially.
My car and the loaner car had the whine. The car shifts perfectly. I would NEVER replace the tranny on it over the whine. Thanks for your feedback, seems to be normal among other ES's.
So i realize this is an old thread, but have a 2012 with a similar whine, very supercharger like, albeit not super loud. Just wanted to confirm it is relatively normal. I dont drive the car often, but I don't remember there being a whine before. It has 41k miles.