Brown Fluid 904 - Exchange fluid myself?

dropping the pan leaves a lot of fluid thruout the trany and in the converter. when we did just the fluid and not the filter it worked really good. it helped shift quality and slippage. sometimes it works amazing. i bought a 89 lebaron with a bad trany. it slipped like crazy. we flushed it completly and didnt do a filter and i got 9k miles outta it before the tranny went south completly. so i am a honest beliver in the way i mentioned