Not sure if you cleared the noise issue. At one time I had the same thing happening. It would increase with speed then go away for a time, then come back. Hope your sitting down while reading this. I shot a ring gear bolt out of the bottom of the ZF case. All ten bolts had come out and were in the case when I dropped it. The ring gear didn't come off. But it could have... The noise was each both hitting before dropping to the bottom...
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