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If 3rd and 6th gears make noise because the gears are straight cut, why don't the other gears make noise?
 

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As to why some 09 gears are noisier than others, I don't know. It is the kind of thing where a very small difference can make a big difference in noise level. Harmonics, slight differences in how well some pairs mesh, etc.
 

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gear whine is all about load and harmonics, IMHO. More whine at lower RPM's applying throttle to a point, then as the rpm's go up it goes away or simply is drowned out. Either way, I don't worry about it at all. Mine does it in 3rd and 6th.

Don't loose any sleep over it.
 
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