There's an aftermarket transmission company called "Pro Trans" in California. They build a LOT of transmissions for NHRA drag racers in a variety of classes. Most of their competition transmissions are modified 904's, but I think they install 904 (or custom-built 904-spec) parts in 727 cases in instances where a 904 won't bolt up. There are a lot of mid-8 second 1968 426 Hemi Super Stockers (900+hp) running these transmissions. I have a good friend who builds racing Torqueflites for a living, and has for 30 years. He told me that a 727 is its own worst enemy, because what usually causes them to fail is not the torque going through them, but the inertia of the heavy internal 727 components starting and stopping from high rpm. They literally tear themselves apart, just going through the gears. His name is Len Schneider, and he has a shop in Grass Valley, CA.
He built the converter in the Dan Fletcher-driven A/EA that just won Comp Eliminator at the Las Vegas NHRA national event, this past Sunday. I believe that's the 2nd national event win for car owner Rick Braun, already this year; it's a former world-champion race car and is really hard to beat in NHRA's Comp Eliminator.
