Nowadays, a lot of mfgs. are making very stout C4s. Much lighter than a C6 (and it's cast iron cousin the FMX) and for all intents and purposes bullet proof. The C4 case is smaller, so easier to mount making it a fav among the drag racers. Plenty of BB C4 options, too. For a 'user friendly' option, check out some of the up-rated AOD units (no electronic overdrive). Best of all worlds.
Performance Automatic Racing Ford Street/Strip Transmissions | JEGS