Rear differential whine, how long can this last?

Phil

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2002 crown vic 213k miles
My rear diff is whining. Fluid changed with lucas no metal bits in old fluid. It was whinning before as well. How long can I drive it like this? It is just a daily commuter car no long trips. I have heard some people say "my car has been whining for 30k miles and other say I am royally in trouble. Looking for some personal experience and or professional opinions. Thanks.
 
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