need help grinding noise and vibrarion in rear diff.

Shift518 Automotive
1

Got a 1990 infiniti m30 and all the sudden there’s a grinding/humming in the rear diff as well as a bad vibration. Any ideas on whAt thios may be and how to fix it.

2

I know nothing about the specific car, but has the diff oil ever been changed?

3

Wheel bearing Prolly took a shit

4

Found out it wasn’t the diff. It the u joint at the tranny. Anyone know where to get 1pc drive shafts

5

Anca,s can rebuild em I Belive