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I already changed the rear diff fluid at 3000 miles, (I'm at 5000 miles now). I took the car to a different dealer that wasn't going to void my warranty, and when the tech took a test drive with me, I was not able to reproduce the sound in the video. Very frustrating, as the sound only happens when going on an incline up or down, but everywhere near the dealership was flat. So they were not able to do anything. Just to make sure, when I came back home, I went right back to the spot I could reproduce the sounds and there it was again. Sounds like air coming out of a balloon. Even though I showed them the video where the sound can clearly be heard, still no help. They put the car on a lift and said everything looked fine, but that sound is not normal and just started happening last week. It's driving me crazy.
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