Wow, sorry to hear all this.
Just fyi, I am one of those that had my Transfer Case replaced under CPO right before it ran out. I was feeling some slipping/crabbing in tight low-speed turns in my parking deck at work. I just mentioned it while at dealer for other service and next thing I know they are replacing it for me.
Unfortunately I have no experience with loose shafts.

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2012 e70 X5 50i MSport "The Boss" black on black *Well Optioned*