Well, I'm still not sure I want to bring it back to him anyway, warranty or not. I had told him that the truck was used for heavy towing and long distances and to beef up what should be beefed up. He told me he put a shift kit in it (not likely, it doesn't shift any harder than before). I can tell you he didn't diagnose the electrical issue that caused me to bring it to him in the first place either. After having rebuilt the tranny, the issue was still there (which I told him in the first place was an electrical issue). So I don't trust him to lock tite and torque those bolts properly (which he assured me they were "sealed" when they went in). This guy was recommended to me by a tow truck driver that my wife has known for years.
Anyway, I managed to get 4 converter bolts in out of 6. The threads are buggered up on the converter. The flex plate is not cracked but a few holes are elongated due to the improper torquing and the bolts working themselves loose.
I fired it up real quick, crossover pipe not bolted back up yet, but no noise from the flex plate area. I'll take it either to him or a good place I know of to replace the flex plate and possibly converter unless the threads can be tapped and the starter.