My 2014 Altima makes a roaring noise that is coming from the rear. The pitch increases as I speed up. If I shift to neutral while driving the noise does not change, except the pitch will decrease as the car slows down. I do not think it is the engine or transmission. I have had the tires rotated and the noise is still coming from the rear. It has been doing this for a long time but may be getting louder. The car has 42,000 miles. Thanks in advance for any suggestions.
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