Rear end noise while driving low and high speeds

[skkrtis]

After buying a 2011 mustang gt with 180k miles, I noticed a rear end noise while driving. Figured it was rear axle bearings or low differential fluid. After swapping axle bearing, and seals and new differential fluid noise is still there. Wondering if its a bad ring and pinion or axle shafts. The video is driver side rear. Any idea whats the culprit?

 

[horse sence]

If you hear it all the time it probably a axle bearing or possibly a ring or pinion bearing ,if you only hear it when excelerating or slowing down it is probably gears ,my 05 just started a full time grinding sound so I think its a axle bearing

 

[skkrtis]

If you hear it all the time it probably a axle bearing or possibly a ring or pinion bearing ,if you only hear it when excelerating or slowing down it is probably gears ,my 05 just started a full time grinding sound so I think its a axle bearing

View: https://youtube.com/shorts/enTzKspWN5Y?si=6YADNZMiQPYLoFrS

 

[skkrtis]

It has new axle bearings and seal but questioning g if they were installed right or possible bent axles. Any way to rule out bad ring and pinion? The noise is there constantly regardless of acceleration or coasting. Cant figure out what it is sadly

 

[skkrtis]

Also in the video I just posted, the axle spins pretty straight. But noticed the driver side isn't perfectly circular. Seems to be oem. Not sure if thats how its suppose to be

 

[Broncin491]

What did it end up being?