fluid type for A-518

i guess i do not have to have a video, a video just seems like it would make it a little easier, this would be my fisrt time evr installing a shift kit, all i have ever done to the transmission is drain and flush the fluid and change the filter.... My old man worked on my auot that i had before this one and now he is gone so i gotta do it myself, and i have been told transgo sells dvd videos with step by step instructions, makes it alot easier when you can accually watch somone do it vs reading what do, at least for me anyways.
And sorry i thought you were one of them who were opposed to using anything but atf+4 in the A-518, out of type f and dexronVI wich one of them fluids would you reccomend using? the dexronVI is compatible to anything calling for dexronIII just like +4 can work in anything calling fro +3, and my transmission got dexronIII as factory fill.
I realize the dexronVI will last alot longer, and handle heat better and flow better in colder and hotter temps but on the other hand type f is alot cheaper and handles heat well and aloows the transmission to shift better.The dexronVI does have some friction modifyers but not as many as +4 and the type f i dont think has any friction modifyers.
My old man ran type f in his 727 and thats what he used relgiously, but im wondering if the dexronVI would be better because of it being a synthetic? and once i have the shift kit installed the transmission will most likely shift firmer no matter what fluid is in it correct?