If you're like a lot of the Jalopnik staff, you've probably got a car old enough to have a dedicated overdrive button on or ...

Automatic transmission cars have the Overdrive (O/D) function which allows a driver to drive faster on the road. The o/d is the highest gear in an automatic transmission. The overdrive function ...

In ye olden days of auto manufacturing, three-speed automatics were fairly common. Top gear was usually direct drive, meaning the transmission's input shaft (which is directly connected to the engine) ...