Why is my transmission slipping when I turn left?

First of all there is NO pick-up tube in this transmission. You either have a filter that screws to the outside of the tranny , like an engine filter, or with the inside filter it is a flat filter that has a short metal collar on the bottom of the filter that sits in the fluid. SEE HERE: https://www.flickr.com/photos/127907981@N06/15580289205/in/photostream/ . HOW ABOUT LEAKS? Have you noticed any fluid under the vehicle? Have you checked the fluid level? Ever notice while driving with a cup of liquid in the car , as you turn a corner , all the liquid goes to one side of the cup? Same thing with oil in an engine & transmission, and if you don't have enough then the pump will suck up air instead of fluid. Engines will light up the oil light. They should have a low fluid indicator on transmissions, to prevent slipping. Cuz slipping is what kills the clutch packs, quick. Check the level. See if it's low . If not, then change the filter & fluid quick. That's all you can do outside a tranny.