I rebuilt the 4 speed in my duster and found it pretty easy. I've rebuilt some Chevy 4 speeds and while relatively easy they still had more things to deal with. Same with these 904s and 727 they're pretty easy then I would probably yes say a little easier than the stick shift. Again I took the pump out and one snap ring and the whole thing was apart. I will take a little time on each little subsection but not a lot... The thing with the automatic is it has the rubber lip seals and they can be a little tedious to get sealed correctly without ripping one. This is where a lot of generic Vaseline comes in just keeping things lubricated and taking your time..
I've done one Chevy turbo 350 and it was a nightmare it had twice as much of everything...