diff. fluid change and wheel bearing ?

hey guys new on here new to the sn95 stang i have a 98 mustang gt 4.6 5 spd. and its all original with high miles so i desided to change my trans and diff fluid. when i changed diff fluid it was pretty nasty looking and kind of low. but the plug had no metal shaving on it. now that i have cleaned it out changed the wheel bearings and seals and put royal purple 75w-90 in it and i used cleaner and a rag to clean it out really good and filled up until to the plug. but now for what im worried about is i drove it home and the next morning i pulled the plug and there are alot of shavings on it. not chunks just shavings so small hard to get off.

so im wondering if somthing is wrong or just clutch wear in limited slip, or maybe i worked some old shavings loose

any help is good help thanks alot in advanc!!