[nutwood]

I've a Chev 383 with a big block torque converter and a TH400 transmission in a Jeep J20.
I recently had the torque converter re-built. After a few weeks it developed a metallic rattle as though something was floating about inside. A few weeks after this the torque converter failed completely. Apparently the inside was like a washing machine bowl full of bits.
The company that over-hauled the converter are refusing to take responsibility, saying that it must have been fitted incorrectly as I did the installation myself.
Leaving aside the fact that I've had the vehicle 15 years and have always done my own work, please could anyone tell me if they know of any way that it could be possible to incorrectly fit a torque converter to cause it to disintegrate internally?