Same problem
I have the same problem with my 2007 model with about 90k miles on it. My repair-shop is convinced it's the transfer box, but searching online and in this forum, shaking and vibration in high speeds are not a symptom of a bad transfer box. The vibration is so violent that the headlights start going on and off and the car is effectively un-drivable. I don't have any error lights on either.
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