you have to drive... The T Ford transmission is an Epicyclic or Planetary gear transmission. Using 3 triple gears rotating around a driven gear, like the planets orbiting the sun. Because the different gear teeth are always in mesh, it is not possible to "crash" or "grind" the gears as can be done in a more traditional style gearbox. To view an interactive animation on the Model T Ford transmission and get a full explanation, view the technical page at www.modeltcentral.com or follow the link on this wiki page.