Rep Power: 0

Ok so I just picked up an 01 Civic LX with 245,000 as a beater. Overall car runs great but it's has a grinding noise coming from the tranny. I have read the articles on the difference between and TOB and an input shaft bearing but mine falls into neither diagnosis. Here is my best explanation.

If I am Sitting in neutral foot off of clutch there is no noise.

if I am moving under load there is a grinding sound in all gears.

If I put the car in neutral as I am going any speed all grinding noise goes away.

I pulled a little bit of the tranny fluid and it is black so I am sure it could use changed but I am curious as of the source of the grinding noise since it doesn't fit either of the common descriptions. Thanks for the help!

 
Rep Power: 125

Just to clarify, it doesn't grind going into gear, but only grinds when it's in gear? It almost sounds like the clutch isn't fully engaging.

 
Rep Power: 223

If you let off the throttle while driving but still in gear does it still make the noise? Bad CV?