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Hello, I will try my best to help you with your concern.
does the noise sound like its coming from the front or rear of the vehicle?
does the noise get louder or quieter while you are accelerating?
sorry for the delay. based on your symptoms you described, it sounds like it is coming from the front differential.
the pinion bearing is worn causing a whining noise all the time even if you are not accelerating.
it could also possibly be a hub bearing making the noise if it is more of a roar and not a whine.
this is just an educated guess, I am not there with the vehicle so I can't hear the noise for myself