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I also had grumbling at high speed decel. One cause was the type of tires I run (R888R), but when swapping to other tires, I realized for sure it was the diff.
When you decelerate (or coast), the pinion and ring will move away or toward each other. In my case, the pinion was slowly developing more in-out slop. You can test this by doing a force test on the pinion, rotating the pinion flange with an inch-lb wrench, and measuring the breaking force.
Mine eventually had none, to the point where I just snapped a tooth off the pinion gear during recent HPDE event.
You may need to remove the diff and just get it serviced with new compression sleeve for the pinion.
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