A common misconception is that the Dodge transmissions are surviving. They aren't.
Drag racing 3 1/2 ton trucks is fairly new ground still. You cut that weight in half and there are plenty of options.
But another problem will bite you in the arse at that point. Gearing. The Allison has a big OD, but most racing transmissions don't. Without the overdrive, you need to replace you axles since the AAM stuff bottoms out at 3.42.
Part of the problem is impact loading, which needs to be avoided. A violent launch or shift will break more than just an Allison 1000, it will break pretty much the entire drivetrain. I busted a Tcase, but others have broken axles, driveshafts, etc.