Guys , you really don't know what im all about (im a newb here) but let me assure you , its not my first T400 build here. Im not here to argue just answering the question with factual data.
What I posted about pressure fluctuations are factual (we are talking about race transmissions with constant system pressure). The cooler/converter pressures and details do happen and if you do not want to agree then its up to you to prove me wrong. This hapens in the real world NOT on the dyno. I have spent thousands of dollars and hundereds of hours with this problem and im not saying this to pound my chest, its good information.
Yes the cooler circuit is defective as it was never originally designed to run at constant pressure so we have to make changes to make it work (external pressure regulator).
Flexplates that offer flex are a good idea is my entire point and for the orignal poster , its not a bad idea to have one instead of the solid wheel you are currently running especially behind a Buick V6 with that tiny little thrust bearing. Its up to the transmission builder to help control the "flex" rate and distance.
Here's another one for you to think about DonWG. Explain in an application where the line pressure is 180 lbs how its possible to see a spike when coming off the transbrake to 240 psi? I'll leave you with that and that is not some dreamed up scenario either.
Hutch