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Help. First I thought the rattling under my car was bad CATs... it got progressively worse and today it stopped. NOW, instead, when I put the car in D or R, I get a very quick (.5 sec) whistle from under the hood. Car is just idling when this is happening but didn't happen when I first turned it on.

I'm getting mixed results from mechanics from 'dealer put in too slick ATF and your torque converter is going bad' to 'it's still just the CATs'. Thoughts? What is this new whistle (not a high pitch, and sounds like a quick release) Thanks.
 
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