i have a 03 g35 coupe 6mt and ive noticed since ive bought it that when at a high rpm there is a chattering noise coming from transmission, it is really loud in the first three gears when you get at or above about 4 thousand rpm. ive read some chattering forums but everybody was talking about aftermarket clutches and flywheels, and as far as i know it is the stock clutch and flywheel in it. i bought it used , but the the person that owned it before me was an older lady so i really dont think it has any aftermarket on it. it just turned over 40,000 miles, so is there something wrong that i need to take it in or is it normal. plz help me.
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MY CURE FOR TRANSMISSION NOISE IS: change tranny oil with REDLINE MT90 GL4. This is made a huge difference and eliminated all tranny noise for me. Just did this change two weeks ago cuz noise bugged me so much. When you change the tranny oil also change the differential oil with REDLINE 75W90 GL5.

4qts for Redline MT90 GL4- tranny oil
2qts for Redline 75W90 GL5- differential oil

I hope this helps