Exploding Torqueflites

Yes, the sintered iron front drum is a problem, but only when the sprag has been damaged. A damaged sprag is the root of the problem. Once damaged, the sprag can allow the transmission to overspeed. The overspeed condition can cause the OEM drum to fail, hence your explosion. And yes, an aluminum drum will remedy the problem, but it is prone to premature wear in street driven applications. The aluminum drum is ideal for race applications, but in street use, the constant action of front band apply/release will wear the friction surface much faster than a steel drum.

When having your trans rebuilt or freshened, ask your rebuilder about this. If he doesn't understand this basic theory, you should probably start looking for another guy.