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Just a thought... There's a Constant Velocity joint where the drive shaft attaches to the differential. They sometimes go bad, or need to be repack. The noise travels down the hollow drive shaft which makes it difficult to locate exactly where it is coming from. When it goes bad, it sound similar to two aluminum bats hitting each other. It has a slightly high pitch metallic sound. If you search the Internet, you'll find a BMW TIS related to this issue.
^ sorry, I must have been typing while you sent the last post.
Second edit... Disregard everything I said. I hadn't had my coffee and was "sleep posting".
Last edited by Pig Farmer; 03-19-2018 at 05:28 AM..
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