[GM man]

Well the specific issue that he was telling me was the number 1 cause of the failures in those 6 speed trans is the clutch lining on the torque converter. When that fails it causes the adaptor plate (I think) to start eating into the aluminum trans case which sends pieces of aluminum through your pump which in turn causes the tranny to crater. That clutch lining (that looks like sandpaper) is fastened to the torque converter with an adhesive that sucks and is the culprit behind the whole thing. He's told me that Raybestos and another company makes a lining that doesn't use that adhesive that sucks but he hasn't been able to get a hold of any of them. I'm no expert and not at all telling you what to do, I'm just trying to let you know what happened to mine and what my transmission guy, who is an expert by anybody's standards, told me about. I wished I would have known this before mine crapped the bed. I hope yours works out, good luck!