Question about 2000 Jeep Grand Cherokee

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Drive train noise

2000 grand cherokee laredo 4.7 with 78k miles.
I can hear what I can best explain as a slightly mid to high pitch static type noise at high speeds and it's more noticable on highway especialy when there is a wall of some sort to reflect the noise. It's hard for me to discribe the noise accurately. I have placed it in park and ran the engine at various rpms and never hear the noice. I feel it is in the drive train, perhaps a U-joint? I pray it's not tranny or diff. The right rear diff seal was replaced by an off road shop recently and about a month before that they installed a 2" lift as well.

Thanks
Bryan

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Likely pinion bearing or carrier bearings. They howl, characteristically, and the howl changes frequency with speed. Do check the u-joints first, though.

Posted on Aug 08, 2008

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