The error said that it's an impossible combination of output of transmission vs wheel speed. That hints at transfer case.

Put all wheels off the ground so you can try to get some motion with no real force.

Watch real-time input and output speeds of transmission.

If you get an output on the transmission that's matched to the gear ratio of R and 1, that suggests the transmission is ok and the problem is downstream. It should be very obvious where that sound source is!

We are all very curious. It could be a blown dif. or transfer case. It doesn't seem like it's the transmission or clutch at this point to me based on the transmission having in and out values from the snapshot

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2011 E70 • N55 (me)
2012 E70 • N63 (wife)