After my carnage, A good friend of mine managed a valvoline and said they started recomending against a flush on high mile engines because of the cars who had issues afterwards. My Z-34 had no tranny issues and I decided to have it flushed thinking it was a good idea. 6 months later I was stranded on an interstate 6 hours from home. The guy who replaced it told me stay away from flushes. Needless to say I have never done a flush since.
Like I said I think I should go the route of dropping the pan and replacing the filter. Then refilling with a high mile fluid like maxlife.