Wow, that's a lot of parts. Good maintenance pays off in the long run. The local shop is so cheap, I will take it to them. It's a GM trans so parts are plentiful. I can do it, but prefer not messing with all the oil.
I might do the transfer case annually. Or every 10,000(?) miles. City life is hard on oil.

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'06 X5 3.0i - bought @143,123 miles (12/26/20)