The transfer case on these is essentially the same as an open differential. That's why your fronts didn't spin when you turned the rears. Under power, it's about a 70-30 split r-f.

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2001 E53 X5 4.4i Sport
Titanium Silver / Black
141k miles, and broken down more than it runs...

2002 E46M3 Convertible with 28k miles - DD