The pump is linked to the engine, and it pumps fluid (regular oil) in to the torque converter. The turbine is linked to the gearbox, and it spins when the fluid through the pump hits it. A bad transmission filter will lead to your gears to grind on one another https://erickyyvss.humor-blog.com/33025834/new-step-by-step-map-for-filter-gearbox