E90 bearings/diff issue

[Bilaal E]

Hi
Been having a weird hum and sway from the back on my e90. Checked all the wheel bearings, tyres and rims, no issues.

My next thought would be that this is from the diff. Is it possible to service or change internals in the diff? Typically what would this cost

Thank you

 

[shauwn]

could just be bushings, maybe do bushing refresh first before looking at the diff, diff bushings tend to give slight vibrations also IMO

 

[husaindindar]

Check diff bushings, gearbox mounts, centre bearing, guibo and also the universal on the prop.
I had a hum come from the prop universal at the back.

I'm not sure what you mean by sway?
If if it is a sway as in handling issues, then look into suspension.