Hmm.. You def have an issue, not sure if motor mount will cause Transfer case issues. X3 front diff is mounted to the oil pan, so any additional engine movement caused by bad motor mount shouldnt be adding stress on driveshaft and/or transfer case..
Insterested to hear the outcome... Did you try reading error codes using OBD reader?
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2016 F80 M3 BSM with Black interior DCT/Driver Assistance/Executive/LEDs/Adaptive/Black Wheels
2014 F32 435i xDrive AW/CR
2014 F25 X3 M-Sport Carbon Black
2011 e92 335is 2007 X3 122k miles 2006 e90 330i 132k miles
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