no i will not.

Just speculating here, but I presume killcrap is referring to the flexible coupling in the driveshaft. Boots are installed on the front axles.

I know these couplings can fail with higher mileage on an E53 and other models for example, but I am surprised that killcrap has seen so many fail on almost-new E70s.

Right.

His dealership is apparently the world's center for E70 axle failureshttp://www.xoutpost.com/images/smilies/bustingup.gif

Probably part #2:

4-WHEEL drive SHAFT/INSERT nut. Fits: 2010 BMW X Series (E53,E70,E71,E83) X5 50iX | BMW of South Atlanta

Could you then post a pic of the joint you smoked?

i dont smoke. so no.

+1 IIRC these are colloquially known as guibos. First cracks start to form in the rubber around the coupling bolts then eventual catastrophic failure but usually after a 100k miles or so. Like you said...

Driveshaft, not axle

Interesting that BMW changed from the Guibo to a universal joint. And then to a longer driveshaft with a universal joint (for production from 4/10 onwards)

A u joint typically flexes more. Could be a torque problem, a harmonic, or too short a driveshaft. Wonder how many are failing?

Not so sure
 

Disagree, at least if the parts book is correct. Yours is listed as a 2009, so is different than these.

Look at this link; notice the dates of manufacture and the break point, the list of models, and the lengths of the different driveshafts:

4-WHEEL drive SHAFT/INSERT nut. Fits: 2010 BMW X Series (E53,E70,E71,E83) X5 | BMW of South Atlanta

Back from the Big Easy. Tourney and French Quarter helped take my mind off the car. I sent a note to the service rep today to find out the status. I'll see what I can find out about the specific parts involved.