Selling a semi without being titled to the person selling it.

Problem with most of the ancient stuff i deal with is it’s been a few generations of family members or has changed hands so much since it was last registered no one knows who's name it was in. All documents are lost and it is only legend or hand me down info that is very cloudy. Last one i did was a 1972 White 4000 that was never titled to begin with. Txi concrete bought it new from a dealership in Louisiana and never registered it. Used it in their limestone blasting pit and asphalt plant its whole life here in Texas. Never put on road. Title was lost 45 years ago and they hadn’t owned it for 25. So as far as the state was concerned the truck never existed in the first place and i had to start from scratch.