The pump not to be confused with the impeller inside the torque converter, is typically a gear pump mounted between the torque converter and the planetary gear set. It draws transmission fluid from a sump and pressurizes it, which is needed for automatic transmission components to operate. The input for the pump is connected to the torque converter housing, which in turn is bolted to the engine's flywheel, so the transmission pump provides pressure whenever the engine is running and there is enough transmission fluid.
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