I'm trying to understand how the engagement of the clutches is varied. I see the power is transmitted through the center input shaft and is transmitted through the four pinion gears, but I don't understand how the engagement of the clutch(s) is controlled based on which axle has more/less traction. Its it a centrifugal mechanism that is not clearly illustrated, or maybe even the shape(conical?) of the pinion gears them selfs? One point I have heard is the front and rear Crown gears are of a different diameters and the diameter determines the torque split(Some what illustrated, larger diameter being the rear axle which statically gets 60% assuming even traction).
One question I would like to answer from all this is, what would happen if traveling at a non-insignificant speed (45 Mph +), and the rear axle was stopped momentarily (imagine hitting the Emergency brake), what results could you expect?