Re: Trans ?
Well, I can give you my personal experience which may or may not help at all.
I replaced my torque converter with the updated "triple disk" one from Ford.
It is NOT the 6.0 converter, but it is supposed to be triple disk, only difference being a thick front cover and lower stall speed for the 6.0 converter. Otherwise the same.
I have a FTVB, don't really like the way it shifts but they are quick and firm, that has saved my trans a lot of slipping.
I also added a magnefine inline trans filter.
If your converter is not dying yet, I would add it BEFORE the coolers, to save it from being polluted if something does happen to the trans.
I truly believe this is why my trans is still together. I'm somewhere in the neighborhood of 375-400 I like to believe, definitely over 350 no matter what, and it's still living.
As far as the cooler, I would NOT do it unless you are having temp problems.