Rear CV joints or... ?

[dragonblue24]

Hi all I have a 2004 X3 and I have noticed a humm that developed in the rear and has increased since. Now especially coasting at slow speeds it's a pretty noticeable vibration.
The tires are pretty new Michelins and it's much more pronounced when not under load which leads me to believe that it's a CV joint or something like that. But a precursory glance underneath did not reveal anything obvious.

So my questions are: is there a good way to test the rear CV joints?
Are the other suspects that come to my mind (drive shaft, differential) more likely than the CV joints?
And lastly if it's a cv joint, does it have to be replaced in pair or does it matter?

Any input would be highly appreciated!

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[jclausen]

If it changes pitch when turning left or right it more likely a wheel bearing, we rarely replace cv joints

[dragonblue24]

If it changes pitch when turning left or right it more likely a wheel bearing, we rarely replace cv joints

I haven't noticed any changes when turning, just when coasting and decelerating, like rolling up to a red light.
A fairly loud low growl at slow speeds and a still noticeable humm at higher speeds

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[jclausen]

I would have a shop dx the sound, don't want to waste a bunch of money replacing parts

[dragonblue24]

I would have a shop dx the sound, don't want to waste a bunch of money replacing parts

That's why I rather fix it myself, I haven't found any shop that seemed to reliably know what they do and don't just swap out parts until it works...🤨
There has got to be a way to check those components I would think...

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