The truth is that all the manuals and lessons that I see by there, if they explain a lot about the gearbox of two axes of three axles, that if pinions that if synchronizers, but of the differential I have found little, it also is that I want to know what happens without removing a screw and that cannot be, there a very good page that I recommend above all for basic concepts that I think are the ones that are the ones that are the ones that are the ones that are the ones mechanicalvirtual.org