04 T-case metalflake fluid
 

https://cimg0.ibsrv.net/gimg/www.f15...ef32e18975.jpg
https://cimg2.ibsrv.net/gimg/www.f15...60022478a2.jpg
Hello, drained my 04 f150 t case and as you can see a nice pearly-metalflake look to the fluid. Drained it last summer, looked the same, case works ok, slight growly noise when driving slow. Never had one apart, would this be a bearing or gear issue?

What fluid are you using?