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Originally Posted by 335iSSA
I had the shop replace the drive shaft, which included a new flex disc (gubio) and center bearing. This is not the problem. Still trying to find the issue.
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It would be best to look at all things that worked on during the install. When the bearing are in good condition the noise is usually caused by lose race condition or possible a bearing race not being seated properly. It can be difficutl to see the with the eye as the diviation might be small. When the noise happen is subjective so it could happen for specific load/speed or all the time but it will be more prevalent when things warm. The nature of the noise is the bearing vibrating at resonate frequency so it can be damaging long term. Theis give you the idea why it happening but i not sure anyone can help pin point it