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Be more specific - whistling from where? The tranny? I've had 2 of them and they both did it. Worried on the first one, ignored the second :)
 

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Same thing happened to me on my 2007 G6 GT Convertable.
It's the resonator ahead of the muffler that is whistling.
Have it replaced and it won't whistle anymore.
 

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Really? I couldn't get it to whistle unless the transmission was under slight load. In neutral I got nothing so I discounted the exhaust.
 
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