Peeps with tremec 3650.. Have you used Mobil 1 ATF fluid?

[KaPPaBaLL]

as subject states.. have you guys ever used mobil 1 atf fluid in your tremec 3650 and have had luck with the grind issue? I already have castro dextron III 3.2qtz in there. did that about 13k ago but 3rd gear grinds are bad when powershifting. Any thoughts?

 

[mogs01gt]

I use Redline