Differing front/rear torque split - how?
Discussion
I've been trying to get my head round various online articles on the matter, but I can't understand how a torque split of e.g. 45:55 F:R is achieved, or the components used to do it.
I know some systems use planetary gear sets, but whatever the system it seems to come out with the same result: differing torque means different rotational speeds (of prop shafts). How would that work? Surely if the front and rear diffs had different final drive ratios to bring the rotational speeds at the wheels back to the same figure (assuming same diameter wheels all round), that would also equalise the torque at the wheels?
Does every system have some amount of slip somewhere to allow for this?
I know some systems use planetary gear sets, but whatever the system it seems to come out with the same result: differing torque means different rotational speeds (of prop shafts). How would that work? Surely if the front and rear diffs had different final drive ratios to bring the rotational speeds at the wheels back to the same figure (assuming same diameter wheels all round), that would also equalise the torque at the wheels?
Does every system have some amount of slip somewhere to allow for this?
Cheers, I think I understood most of that! 
Just to make sure I understand 'overspeed', your example of on open diff with one braked halfshaft, crown wheel at 1rpm and unbraked halfshaft at 2rpm is a demonstration of overspeeding? Am I right in thinking that on a normal open diff with no braking facility, if a wheel slips and 'overspeeds', it's not actively overspeeding because the wheel has no traction and the torque is providing no drive?
Just to make sure I understand 'overspeed', your example of on open diff with one braked halfshaft, crown wheel at 1rpm and unbraked halfshaft at 2rpm is a demonstration of overspeeding? Am I right in thinking that on a normal open diff with no braking facility, if a wheel slips and 'overspeeds', it's not actively overspeeding because the wheel has no traction and the torque is providing no drive?
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