How that Pumpkin on Your Rear Axle Works

Once you get past the 1930's production style and the synchronized motorcycle driving parts, it's actually a pretty good video on the subject, here.  It starts with the very basics and works up through tinker-toy models then through to the real thing to give an intuitive view of these mechanical wonders.

I haven't set up (and don't intend to set up) a general "automobile" type tag, so just file this on under "Mustangs."