Trans noise?

I had a friend bring his 68 Camaro over one time. Just drove 30mph for 20 miles due to a knock at 40mph. After trying everything, it was solely dependent on that speed. Found the windshield trim was loose - 40mph and above made it vibrate and "knock". He grabbed the trim and ripped it off and threw it. Then continued on his 500mile trip without issue. Just thinking out loud. I had a crazy squeak/squeal in my Demon on Sunday for the first time ever. Found a bad wheel bearing.