My Experience with TCI.

We pulled out the transmission, and found that the TCI converter was not made properly and bottomed out in the crank as well as against the pump. It galled the shaft, and tore the babbitt bushing out, that worked its way past the converter seal and tore the seal. So thats where the leak was.
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So are you saying that you checked for fitment of the converter into the end of the crank, and engagement of the hub into the pump splines prior to final assembly, and that after the trans was bolted to the engine that it all was fine? That you had the proper distance from the converter bolt pads to the flex plate etc? That type carnage just doesn’t happen if those areas are checked and verified. Very peculiar to say the least! Costly regardless