I searched all over nasioc and clubwrx for someone with the similar noise that I've been getting since I got my car. (5 months). I get this strange grinding noise, like the syncros are grinding into each other when I’m decelerating. I also hear the whine that it normally makes. The grinding only happens when I have in gear letting it coast. It stops when I touch the gas. My friend told me the transmission would naturally make more noise since it was closer to you, than in a FF car. Other than that noise and clutch shudder in the mornings; the car runs drives and works excellent. I always baby my transmission, I always rev match. So I didn’t really do anything about the noise. I’ve debated with myself if I should take it to the dealership, but I would half to remove my kartboy short shifter. Not to mention a bunch of other aftermarket parts. I was hoping switching to synthetic transmission oil would do the trick. Anyone have this problem?
I hope it isn’t syncro/teeth shrapnel loose in the tranny.