[MT-2500]

The convertor would need to be cut open to find the cause of destruction.
But.
The only installation thing I can think of would be no end clearance.
Or possiable a lot of metal from inside transmission or oil cooler.
What was the end clearance fly wheel to converter when you installed it.
Wascooler flushed out when converor replaced?
When a convertor shells out it throws metal all of the way threw the transmission.
Did you go all of the way threw the transmission when you replaced the convertor?

Always use a good quality rebuilt convertor.
One of my pet pee's is Dealer OEM parts does not furnish Brand new convertors.
There is a lot of cheap rebuilts out there but that is what you a cheap rebuild that does not have all parts replaced and rebuilt right.

I use a company in Ohio that puts a liftime warrany on there convertor.

If you want there name and address let me know.
But not at a cheap price.