If you manage to replace the viscous coupling with a solid link you will break something, it is there to allow for the slight difference in tyre diameter in much the same way as the differentials do on the front and rear axles.
On the old Landrovers (S-III and earlier) you could lock the center diff but ONLY when off road as the tyres would need to slip to avoid transmission "wind up", in the case of a V70 AWD if you eradicate the viscous unit the first part to fail would probably be the angle gear or a rear drive shaft - Mike
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