Mine has it also. I asked about it last winter and was told that it was normal. They actually started 1 they had in the lot and showed me it also had the whistle. He said some people notice it but the majority don't. It doesn't bother me other than when it's in the garage.
Hello everyone, I am sorry to hear that this whistling noise is a chronic problem, and I might have to live with it. I just bought my Cherokee and the dealer replaced the rear differential motor. Or box. I still have the noise. I had no idea this is a common problem.
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