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Old 02-01-2011, 12:45 PM   #15
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Join Date: Apr 2008
Location: Boston
Posts: 4,765
My Ride: 2003 325xi
Originally Posted by sbiggi View Post
Different tooth count off the input shaft in the trasfercase. I havent seen inside one of these, but I imagine there is a set of spider or planetary gears in the center diff that outputs to the driveshaft.

If it wasnt a open diff the car would bind up like a truck in 4x4 in parking lots.
It can be either open or fixed.

Torque is split 38/62, not speed. The front and rear diff is open. The TC is not.

You would only ever have one wheel getting power if there were open diffs and an open TC. It's obviously not 100% locked up, and can obviously slip a a bit. Think of it like an LSD with 99% lockup. Definitely not open.
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