Don't forget that BMW also do their version of 4WD xDrive. It is quite a bit different from quattro in that it still has engine quite a bit towards to rear and front wheels close to front. They do not put front diff in the gearbox but a separate front diff and another propshaft going from gearbox (transfer box )to front diff.
This is a picture for E30 325ix but others use similar layout.
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Currently 8less
2011 Q7 S Line 3.0TDI, 2016 Tesla Model S 90D
8 history:
2006 A8 Sport 4.2TDI quattro SOLD,
1997 S8, reached end of life with gearbox failure
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