A Little Help. 1980s Truck 727 in an A Body?

Thanks, The ID shows that it came with a lock up converter. Does that mean I have to run it with a lock up converter? Why wouldn't I want to. Wouldn't that would help mileage? Have not had a Mopar with an Auto since the 1980's... Last one I bought was a Cheetah Reverse Valve Body Manual shift. Banged the gears really well. it would eject cassette tapes shifting 1st to 2nd! :-)