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Your diff is rooted. A bearing/the bearings have failed, causing the differential to float around in the housing. It sounds like a flat tyre and howls above 50kmh.
Get the car onto a hoist or securely raise the rear on stands and chock the front, get the rears spinning up to the noisy speed and have a look at the pinion (input) and output flanges. The last one i dealt with had failed carrier bearings and it also had oil leaking from one of the output seals. The output flange oscillated.
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