Question: what are automatic transmission parts?
Answer: Transmission Casing.
Torque Converter.
Pump (aka impeller). The pump looks like a fan. ... 
Turbine. The turbine sits inside the converter housing. ... 
Stator (aka Reactor). The stator sits between the pump and turbine. ... 
Torque converter clutch. ... 
Planetary Gears.
Brake Bands and Clutches.