Four Wheel drive vehicles require a transfer case to harness power from the transmission and move it in a non linear fashion. Usually from the rear of the transmission to the front drive axle. In some cars it is from the front drive axle to the rear wheels.
DD BMW 27107504567 OEM 27-10-7-504-567 (USED) REAR TRANSFERCASEE E53 X5 3.0i
DH BMW OEM USED 31507578156 FRONT DIFFERENTIAL 3.08 2010-17 550iX 650ix
DH BMW 31507555883 31-50-7-528-555 OEM USED 7555882-032009 FRONT Differential MANUAL EAH 48W 3.38 328iX 6 SPEED
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DH BMW 27107599690 7599690-01 13774410 USED OEM REAR TRANSFERCASE AUTOMATIC 2010 528Ix