It essentially installed a "married" overdrive unit to its manual transmission, something rare in a production vehicle of this type.
The Super Shift gearbox was developed from a standard four-speed manual transmission for use in the first generation Mitsubishi Mirage, the company's first front wheel drive model.
[1] Because the transmission was mounted beneath the engine, the gearbox needed to take power down from the clutch.
[2] In practice, it was very difficult to use all 8 forward speeds in sequence because every second change required movement of both gear levers at the same time - something which was almost impossible without using both hands.
[2] Production of the Super Shift transmission ended in 1990 with the discontinuation of the Tredia and Cordia series of vehicles.