At least in X5s I get the sense that transfer cases are failing all over the place. Lawyers are collecting cases for class action law suit. Mine just failed. I have been on star spec OEM pirellis though so I don't think tires are the cause.
Frankly if BMW transfer cases can't withstand slight variation front to rear, that is a design flaw. Other manufacturers of AWD vehicles do not need special tires etc. to keep their transfer cases from failing.
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