Limtied slips transfer the power(mechanically) from the spinning axel to the one that is not. The RSC has no way to do this-brakes don't link axels.. It just applies the brake to the spinning wheel and hopes some of the torque will transfer. I have already asked why some folks believe that the RCS is better than a Limited slip/posi traction and I got interesting answers so I have left this alone. I am just as disappointed with not have a posi in the rear or at least the option of one. I would have been VERY happy with a selectable air locker like ARBs but....Ford did what they felt would work the best in all situations...too bad for some of us.