2nd gear clunk, rubbing, grind

cooperreese

Hey Guys....
I read all your posts and I have the noisy, clunky, 6MT on my 2009 370z Base model as well....
But mine also grinds into every gear on downshifts. 6-5 is the worst.
It will do this until the PT is good and warm (In my case, thats usually about the first 15min of driving every day).
I have about 25k miles.
I am going to get a flush as soon as I can get the time. But the Mech I took it to said the fluid was dirty and had particles in it.

Now, being an aviation mechanic, darker oil in a semi-closed system is usually caused by contaminants, either metal flakes (minute or not) wearing off gear teeth or they are caused by improper lubricant used in gearbox.
Now, if I have dirt in my system, it obviously got in to the system before I got the car (which I purchased brand new).
I have not been driving around with a dipstick missing or plugs removed.

How the hell could dirt be in the system unless it was in there from tranny assembly at factory?

Thoughts?!?!