Dangerous?

I had a piece of a 904 converter snout break off once. Made its way back into the front pump mechanism, got ground up and shot fragments through the rest of the internals. Locked up the entire drive train including the rear wheels going down the interstate at 60 miles per hour in a slight curve. The locked rear wheels made the car kick sideways. Fortunately, after a couple seconds, something else in the transmission broke and the tires freed up before I was completely out of control, and I made it to the side of the road where I waited for a tow truck.

In addition to all that excitement, the fragments that made it back into the internals, wedged a bunch of parts together and the transmission shop had to beat the thing apart only to find out I would be cheaper off buying a new transmission than replacing all the damaged parts in that one.

So yeah...Dangerous in my book. And way more expensive in that case than a new high quality converter.