Fluid Pump
WARNING: This page is about a different car, the 2006 Ford Pickup, 2006 Ford F550 Super Duty, 2006 Ford F450 Super Duty, and 2006 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
This transmission has a gear type pump that supplies fluid under pressure to the hydraulic system.
The torque converter impeller hub rotates the drive gear of the pump.