Hmmm. The central differential is an epicyclic gear (planetary gearng) which transmitts the torque 47% front and 53% rear. If you remove the driveshafts from one axle the driving torque on that axle wants to accelerate the outgoing shafts extremely fast as they have almost no inertia. Meanwhile the Ferguson Visco clutch tries to prevent the speed difference to arise between front and rear axle. Consequence: The visco clutch will burn in hell!
Solution: Weld the epicyclic gear so that it can't counter-rotate.
Solution: Weld the epicyclic gear so that it can't counter-rotate.