Go with any POA synthetic
I'll agree that Mobile 1 is a good product and I have to put in in my trans in a pinch but there are betters our there. I like Amsoil becasue of the Warranty. I also get it at dealer cost which make it cost competative to anything on the market. I also like the fact...
trans update
Here is what I think you should do. Speaking from FH experience as how I broke my trans with some simple mods. I hd a VB update on order and the trans gave up the day it arrived.
Valve Body update from BTS or orhr repoutable Ford Trans god
Bigger Trans cooler if you tow or...
Trans Upgradew
I personally have a BTS but I would say go for the John Wood since your so close. He's the only gut out there that uses a completely new update convertor in his rebuilds. I blive it is baised on the 6.0 convertor. He laso uses a new updated oil pump. I think JW is close to...