After a couple months sitting and I trying to figure out and research what the "chatter" was as the BMW dealership parts counter guy calls it. Was it the Guido? Or CSB, or loose rear drive Shaft?
Finally, deducted it was the t-case...DTC 5f3a... had half a bottle of Rock oil on the shelf 0870. That did it! The horrid vibration, stiff turns and difficult maneuvering in tight parking... all gone!
Now it seems the ecm is trying to relearn itself. CEL has vanished only to be replaced with the trifecta lights and then on the second day of driving in the city I have a clear dash free of any faults....of course at the start after changing the t-case fluid I cleared all faults with the foxwell.

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