Working on the roof can be dangerous, especially the steeply pitched ones. I’m not going to tell you that it’s something best left to the professionals, because it really burns me up when people shill like that, but I am going to say that you might want to think about using a safety line if you do go up.
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Some lucky souls have the remarkable gift of immediately and completely grasping the functions of an assembly, but for most of us, it takes a while. The differential is a great example of this — an everyday device with simple parts, but their operating principles can be a little hard to understand, even before you start throwing limited-slip devices, lockers, and electronics into the mix.
Fortunately, there’s this neat, old-fashioned, Chevrolet-produced explanation of the bare-bones automotive differential. It looks like it was made in the fifties or so, and even if your understanding of this little piece of the grand automotive puzzle is complete, it’s still a cool video. There are some neat little historic tidbits mixed in, and (weirdly) some synchronized motorcycling at the beginning (skip to around 1:50 if that doesn’t catch your interest). All in all, this is a nifty little throwback with an educational twist, and well worth ten minutes.
How a differential gear works [YouTube]