Brown Fluid 904 - Exchange fluid myself?

pull one line and see which end the fluid comes outta and put that end into a oil catch pan or something to hold about 12 quarts of fluid then start the engine. it sounds like it will need to be in neutral but i would say go thru all the gears and park and neutral and flush the crap outta it. while fluid is coming out dump more fluid in the dipstick tube. be sure to not run it low on fluid and keep putting new in till is comes out clean thru all gears. that is how i have always done it and it works great. usualy we did just that and didnt worry about the filter but now that i think about it the filter would be a good idea to do along with all that. i cant decide to do the filter before or after that. i think before but whichever you think would be best.