Stumbled on this youtube channel, seems to do a good job of explaining mechanical things. Always wondered how the hell the Torsen worked, thought i'd share.
https://www.youtube.com/watch?v=JEiS...ature=youtu.be
https://www.youtube.com/watch?v=PEdnH7_7_yc
And here's this awesomely oldschool video explaining the basic concept of a differential.
https://www.youtube.com/watch?v=yYAw79386WI