Wouldn't expect the gears to go bad, but you haven't suggested the past history of car use. Bearings might be bad but you should be able to tell, they may grind or feel rough to rotate (probably have to disconnect the halfshafts and dshaft to make that assessment).
AFAIK the diff is pretty robust.
Charlie
Your mission, should you decide to accept it, is to add value to these threads, either by pictures or by descriptions, so the next person with the same or similar problem stands on your shoulders.
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