A new rear diff noise


May 2, 2018
A month ago or so, i noticed when coming to a stop,, i can hear whet i suspect is the rear diff, winding down.. sounds like whobb whobb whobb whobb.
There is also what sounds like a hum at particular speeds when accelerating, but hard to hear with the exhaust.
It's when going straight.

I have gears maybe 7-8 years old installed by a reputable shop. Last year swapped the rear diff fluid with new.

This one is beyond me, any advice would be appreciated. Car has 86000km
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