The freelander is in permanent four wheel drive through most drive is to the front wheels with eight per cent (originally) to the rear during normal driving. Drive to the front wheels through the IRD is permanent and fixed but drive, to the rear wheels depends on the viscous coupling which is variable.
The VCU contains a row of slotted disc rotors alternately attached to the input shaft and the outer casing and revolving in a silicon jelly like fluid. The rotors attached to the input shaft are driving by the front prop, and its speed is dictated by the IRD. The disc in between these fix to the outer casing are turned by the rear prop shaft and their speed is dictated by the rear road wheels. During normal road driving, the rear wheels will follow the same speed as the front wheels so the disc in the viscous coupling are each being tuned at a similar speed, and the fluid is undisturbed.
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