Odd diff noise, I think

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Hey guys if someone could help me with this it would be great.

I have a 2011 D40, 4x4, MT. 290k on clock This is my daily drive to work, about 150km round trip.
2 weeks ago I started to hear a strange noise while I was coasting down a hill. My first instant was to change my oils as it had been a while, but no change to the noise. So I did some testing and the following is the information I hope will help someone.

The noise only happens when in gear but no accelerator pressure.
Once I move out of gear noise stops( either placing mt in neutral or applying the clutch)
If any pressure if applied to accelerator noise stops
Noise is in all gears(reverse included)
The sound changes with increase in speed
No change to noise with RMP change
Breaking does not change the noise
I have changed all oils in drive line(front diff, mt, trans case, rear diff. No change to noise)

If there is anything else you guys wanna know.. help would be great

 

[Old.Tony]

It might just be a worn uni. Jump under and give the two drive shafts a shake, they shouldn't move.

 

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It might just be a worn uni. Jump under and give the two drive shafts a shake, they shouldn't move.

Rear one shakes and squeaks a bunch. It's rear bushes also look super wrong. So thanks for this it gives me a starting point

 

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Rear one shakes and squeaks a bunch. It's rear bushes also look super wrong. So thanks for this it gives me a starting point

All fixed changed out both uni joints on the rear and smooth drive with no noise
Thanks old.Tony