A perfectly working stock setup would probably work better than only front disks but IMO it is not worth wasting the money on repairing the stock brakes when you know they won't last very long. The only thing that sucks about having no rear brake is that you have no parking brake. if I were you I would just do the front brake conversion and leave the rear until you have some extra cash. My rancher only has the front disk conversion and nothing inside the rear drum and stops very good.