MAKE’s photo editor, Sam Murphy, sent us a link to this 1930s Chevrolet educational video which describes how a differential gear works. Skip ahead to 1:50, if you don’t want to see the rest of the video (which is highly entertaining throughout).

How Differential Gear works [Thanks, Sam!]

Gareth Branwyn

Gareth Branwyn

Gareth Branwyn is a freelancer writer and the former Editorial Director of Maker Media. He is the author or editor of over a dozen books on technology, DIY, and geek culture. He is currently a contributor for Boing Boing and WINK Books. And he has a new best-of writing collection and “lazy man’s memoir,” called Borg Like Me.


  • sean

    Low Center Drive = Hypoid Gearset which is more of a sliding contact requiring EP sulfide additives to give the heavy oil greater shear strength.

    Pretty good visuals, now we need to add limited-slip and positraction!