1987 300TDT Transmission fluid change

[1987-300TD]

Planning to change my tranny fluid in the next week or 2. I am looking at filters and a gasket.

* Should I go with MB filter or is Mann the OEM? I do not want to go less than Mann.

* Should I go with MB for the gasket?

* Are there any other parts I should change while I have the pan off?

* Is there anything else I can check while I have it open?

I would like to completely drain the torque converter also. I remember reading a post about having to turn the converter to get to the drain plug. How do I turn the torque converter?

Thank You!