Grind = Solution?

Ok guys help me out. i have the p20/A000 trans and it grinds when im at a high rev or even sometimes just normal driving. I changed the trans fluid a couple months ago but it did not seem to help. I noticed metal shavings in the bucket i drained it in.
I don't get stuck in any gears and its not so bad that I want to change out transmissions right now. What can i do to solve the problem or is replacing the transmission the only solution?
