Be careful writing the trans of due to "glitter". If the matal particles are silver and magnetic then its metal shavings. If the particles are golden and brass (non magnetic) then its normal.

Check the bellhousing area as driggs posted then open up the trans. Something broke free, possibly a portion of the diff or even one of the gears. I have many parts so if you can determine which part it is then let me know, i might have one laying around.

Terry