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02 C4S hearing high pitch sound on 3rd gear


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I have a 2002 C4S manual trans with 42k miles. I'm hearing this high pitch whinning sound coming from the rear while on 3rd gear. Not happening on any other gear. Sound comes on only when I'm on the thottle. I've had 2 mechanics, one independent Porsche shop and the other was a Porsche dealer and both of them found nothing mechanically wrong. The car drives fine but it is so annoying that it makes me want to get out of 3rd right away. I'd like to get to the bottom of it while the car is still under extended warranty. I'm afraid it might turn into something major later on. I'm asking if any C4S owners have had this issue as well or if anyone have any idea on what could possibly be the problem.

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