Abstract: An automotive transmission comprises first and second gears, planetary gears, and a ring gear. The first gear is rotatable about a first axis. Shafts are radially slidable on the first gear and extend axially parallel to the first axis. The second gear is rotatable about a second axis. The second axis is parallel to, and at a fixed offset from, the first axis. Each of the planetary gears is mounted on and rotatable about a respective one of the shafts. The planetary gears mesh with the second gear. The ring gear is coaxial with the second gear and has teeth that selectively mesh with less than all of the planetary gears at a time. The teeth are adjustable to change a distance from the axis to the teeth to changeably set a gear ratio between the first and second gears.