There are three sets of digits, left tranny hard point, center front, and left hard point. I have not found the center one yet, its cold and dark. I was able to decode part of the number. The serial number was on the right side all along, I just didn't rub it hard enough. I was able to confirm it is a 4000 built in the US on March 21, 1970 during the day shift. The weather is nice that time of year and people are generally happier, so that's good.
The center one is one I want, that's the one that tells me all things that are obvious simply by looking at the tractor.
I could not find out anything about the number on the left side, which is maybe the engine number? It looks like it has some meaning to it, so the curiosity will keep me looking. But in the meantime got all the fluids changed and getting used to operating it. It's mainly going to be used for road work. A bucket would make it ideal, but the box scraper with rippers, a blade, and skidder setup are going to keep it plenty busy.