The D3 on your gear shift communicates with the automatic transmission to only use its first three gears, whereas any gear ...
Automatic transmissions are a wonder of planetary gears, torque converters, and fluid. Here's how it all works to get you the speed you need when you need it.
They're oddballs of the transmission world, but they're great for moving a powerful drag racer at super-high speeds. Here's how Lencos work.