The transmission in the modern motorcar -- the mechanism that makes it possible to have three forward speeds and a reverse -- is a series of levers, levers that spin. Producer: Handy (Jam) Organization Sponsor: Chevrolet Division, General Motors Corporation #Chevrolet
![Spinning Levers - How A Transmission Works (1936)](https://cdn-ak-scissors.b.st-hatena.com/image/square/a023bf1bccb2b43f8c9e2623395d635f57bd7de5/height=288;version=1;width=512/https%3A%2F%2Fi.ytimg.com%2Fvi%2FJOLtS4VUcvQ%2Fhqdefault.jpg)