Noise at rear differential

[muk5]

I have this noise coming from the rear differential only under load and
at pretty much between 40-50 mph .when i remove my foot off the gas
pedal ,the sound goes away .
i'm pretty much sure it's not the wheel bearing or the guibo flex coupling.
it sounds like something is out of balance .
Can anyone suggest which bearing would make that noise?
or common bearing noise?
Any advice would be much appreciated ?

[Montizzle]

If it sounds like a "CLUNK" or "BANG" noise, then you have prolly broken the diff bolt. Its a very common problem.

[BMWJNKY]

Originally Posted by muk5

I have this noise coming from the rear differential only under load and
at pretty much between 40-50 mph .when i remove my foot off the gas
pedal ,the sound goes away .
i'm pretty much sure it's not the wheel bearing or the guibo flex coupling.
it sounds like something is out of balance .
Can anyone suggest which bearing would make that noise?
or common bearing noise?
Any advice would be much appreciated ?

If the noise is steady under load and constant crusing but goes away when you lift off the gas its probably the input bearing in the nose of the diff.