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I took the GT into the dealership recently (finally found a decent one after the 4th try) and complained of a groaning sound most noticeable when taking off from a stop and also a higher pitched whirring sound at highway speeds. They said they replaced the transmission mount with an updated version and it seems to have cured 98% of the sound. Im happy, just thought I would share in case anyone is experiencing the same sounds.
 

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good to know, when my car is parked on a slight to moderate grade, like my driveway, and start up cold, i get a terrible noise and gets way worse when i pop into drive...
hoping it gets worse soon because the dealer wont acknowledge as is. they say, even if we can reproduce the sound, if we cant find what causes it, then we have to charge you the labor just for looking... SUPREME J.O.Y. (jacka$$ of the year)
 
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