Picked up car on Monday. Sat with the service manager and went over everything. Noticed that the paperwork mentioned front axles, but I ahve confirmed (twice) by phone and email that it was the rear axles. They also replaced the guibo instead of the entire driveshaft and bearings they had previously told me.
Sudder at 60 and 25mpg decelleration is now gone, but I'm feeling something int he 40mph range now. Didn't have time to drive the car for long and my wife has the car. I'll spend more time behind the wheel and determine the next action.
Emailed BMW North America Monday and have yet to hear back.