The pump is linked to the engine, and it pumps fluid (normal oil) in the torque converter. The turbine is linked to the gearbox, and it spins if the fluid with the pump hits it. A foul transmission filter will trigger your gears to grind on one another as well https://filter-gearbox87419.blogsvirals.com/33219314/not-known-details-about-filter-gearbox