I am not a mechanic and at the risk of sounding stupid, I'm going to go ahead and ask this question anyway. Is there any way to convert my open differential to a the limited-slip without having to buy a completely new diff? I have a 96 Miata which will hopefully be complete for the 2012 season and I intend on running 4.77 gears. ALSO, if I am able to convert from open to LSD, will I have to change anything with my gears? All advice is appreciated.