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My experience with the AOD/4R70W is that they all whine in 1st gear because of the ratio/speed they're turning; every one I've heard does that slightly. See if it goes away when it shifts to 2nd. If that's the whine you're hearing I wouldn't even worry about it.
My AOD does that, it's quite noticeable. If you listen closely you might even hear it more quietly and at a lower pitch when it goes into second.