there is a certain 98 Ranger with the 5.0l, 4r70w and 4406 t case running around here somewheres
I put the AA adapter in my 88 BII so I have 5.0L 4r70w and bw1354E
in my 96 sploder I have 5.0L 4r70w and 4406M
I would never use that $600 advance adapter again, no way in hell
You see the problem is the adapter and output shaft are $550+ then you have to rebuild the 4r70w to install the output shaft, another $800-2000 then when something goes wrong with your 4r70w you are stuck rebuilding this unit, to fit your truck, otherwise you need to swap t case and driveshaft setups again.
I would rather run a dana 20 without expensive and internal parts required to adapt, spend the $$$ towards an Atlas... or best yet Stuff the 4406m under there
this way when your 4r70w has issues you can buy a new one, use a junk yard unit, or get a new core for building... you are not stuck with the expensive AA parts
Live and learn
I will be going 4406 in my Bronco II someday