Well something in the story is missing. You said the tranny was leaking bad after cruising. If you read my reply then you know the valve body causes this problem (somehow). Now you say that it sounds like it is severely broken, that doesn't happen from overheating. Did you romp on it in first and let off hit it again, if your valve body doesn't have low band apply then that is what probably broke the internals and be happy that it didn't come apart entirely :-(