Q: on my lincolnls v8 in rear of car when i drive it sounds very loud on 2000 Lincoln LS

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it sounds like a whinding sound i was told differential,and also told drive train
(1) Answer
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The differential is part of the drive train. Has anyone checked the oil level or have they said it is differential bearing that have failed. Have the checked the rear wheel bearings to see they are not the source of the noise?