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Noisy diffs used to be very common, and they could go for decades without attention or failure. BUT modern diffs are usually pretty quiet unless there is a significant problem. If this problem is that there is no oil in the diff, then failure is imminent, as it is if the noise reflects a bearing that is failing. If it is because of a slight loss of preload on the pinion bearings, then it may not be a problem, nor if it has had water in it but now has the correct oil, or if it has been badly adjusted when being repaired.
However, if I owned it, I would investigate as a matter of urgency to find out why it is noisy - a simple step would be to drop the oil and see what came out apart from oil, and check the prop shaft yoke for sideways movement (assuming it is rwd).
John
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