I have been in contact with Keith. The only Griners he has go into his transmissions. Hotch has 2 left but are spoken for. More than likely will get an A&A. Does ATI make their own valve body for 727?
Cant help but ask when you yourself said the car was built to be 99% street driven why you are so concerned about a trans brake?
That said, i used to have a Griner brake on my blue Duster. I took out a thrust while it was in the car. The guy i sold the car to told me his tranny guy stated the very high line pressure that brake likes was the cause of taking out the thrust bearing. I dont have enough knowledge to know, just relaying what i heard. Know a lot of guys using the A&A brake, certainly think its a good unit, love how mine shifts. Wont be using the brake function just yet.
Btw, i saw ZERO difference in ET’s or 60 foots with the blue car off the foot or the brake.
If i had a predominately street car, doubt i would bother with a brake. Very little benefit unless pro tree racing or bracket racing aid perhaps. But they can brake stuff