Regarding C6 transbrakes,back when I ran an automatic in my 428 powered Fairmont, I had a C6 with a reverse pattern, full manual transbrake valve body. I ran the transbrake valve body for maybe 8 or 9 seasons, and I never had any reliability issues at all. I ordered the valve body from the Ford Motorsport catalog, but I guess they were made by Art Carr, as there was the name "Art Carr" cast into the valve body. When I was racing the Fairmont in 1990 and 91, I ran the car in NHRA Super Street (10.90 ET index), which at that time, had a 2500 lb minimum weight along with a .400 sec "Pro" tree. With my car 700 lbs heavier than the minimum, at the Pro tree, the transbrake was kinda slow releasing, I had to use real short front tires to get RTs even close to the mid .400 range, usually was in the 470-.480 range, not very competitive even back then. After 2 years of losing 1rst round every race, I put in a delay box, and ran in Super Pro, which allowed electronics, and used the .500 Sportsman tree. With this setup, the Fairmont was very competitive, won many races, and was a constant top 5 finisher at years end. With the full tree, the fact that the transbrake was a bit slow was of no concern, and with the delay box, leaving off the top bulb, I normally ran between 1.060-1.080 seconds to get very steady and repeatable .500-.520 RTs. I believe since NHRA switched the Super Street class to a .500 sec Pro Tree, the old C6 and transbrake could be very competitive. One minor issue I did have with the Carr transbrake, was sometimes when I pressed the transbrake button, the car would roll forward a couple of inches before the trans locked up. Acouple of racers suggested that was due to some trapped air in the transbrake circuit. I found that by giving the transbrake button a couple of quick taps, to purge the air, the problem was fully eliminated. Most all of the competitive Ford powered Super street and Super Gas cars run Powerglides, I just refused to stick a Chevy trans in my Ford, and having driven several 9 second Super Gas cars, I am glad I never did. Almost as glad as when I sold the automatic and bought my Jerico 4 speed!