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It could be a bearing in the diff has gone south, sometimes you just can't see pending problems in a bearing. Then again differentials do require precise measurements and alignment. You don't just 'slap' one together. Too much preload and *poof* there goes a bearing or two.
It could also be that they replaced some/all the bearings in the diff and not the ring and pinion gears. It's almost impossible to set the gears back into their prior wear paths and noise/whine would be inevitable, it's just a matter of how much.
No matter what's happened, I personally would consider the diff under the same warranty as the transmission. Read your warranty carefully.
Good Luck,
Beav
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