George, do you think that a grade 8 nuts from Home Depot would be good? How about using a lock washer? I don't think adding one of those would hurt but then again, I don't know. I know to stay away from stainless steel on anything exhaust related.
Ron, I see I'm going to have fun trying to get that factory plastic pressed u-joints out. lol The new ones I purchased form Rockauto are the kind with the grease nipple. I did order gaskets off Amazon a day after I bought the catalytic converter you recommended because I hadn't realized it didn't come with two of them. It did come with the gasket on the left side, however. For the first time ever, Amazon lost my order and my parts never arrived so I've had to reorder the one gasket for the right side...so I have to wait until Saturday. There isn't a gasket for the muffler connection, correct?