*final update on this thread*
Finally figured out what made the last tranny fail. In talks with the Tranny tech at ford the tear down revealed : Apparently there is a 'wavy' disk in the clutch pack that was not as wavy anymore.
Cause : possible of three
(1) "to many hard launches" with to many people in the car. like the hellcats and over-tuned SRTs if you do hard launches with a car full of people and to much grip and not enough 'give' in the suspension and drivetrain it just overstresses the components. and this one failed. you can get away with it many times.. but it will fail eventually. I admit, I have hard launched with 3 passengers on many occasions. not like dozens.. but definitely done it a bakers dozen or more.
(2) I ran it to hard 'cold' and the fluid did not protect said wavy disk, fluid flows slower and thicker colder, and he theorized if i ran it too hard cold the fluid simply did not flow fast enough to pull heat out of the disk, or it just did not flow fats enough and it got hot, soft and got smooshy. >but this I do not do. like SBS,BPD,FoMoCoSho I wait 15 minutes of actual travel time before hammering it<
(3) the ''1st tuner'' I had did not put in torque control on shifts .. and it got banged up in the 1st few YEARS of drag racing at PIR and WoodBurn and just elected to eat the disk a bit later in life..