Is there an automatic 3 wheeler transmission that shifts automatically?

Yes, there are automatic 3-wheeler transmissions that shift automatically. They are commonly used in vehicles such as tricycles, scooters, and auto rickshaws. These transmissions work on the principle of centrifugal force and use weights or rollers that engage with a pulley or cone-shaped drum to change gears as the engine speed increases. Automatic 3-wheeler transmissions simplify riding by allowing the vehicle to shift gears without manual input from the driver and are primarily designed for ease of use in urban environments and by less experienced riders.