Thanks for the info, guys. One hub was clearly loose, and both keyways are chewed up so the hubs were spinning on the shafts even though the nuts were way tight. It looks like the PO greased the tapers. I was curious about the white lead, something before my time. All I could find online was a reference to using it as thread locker. Part of my interest in the Jeep is the opportunity to learn about technology from another time.
That 660 looks like a good product. I'll give it a try if it looks like there's too much wear on the parts for a solid fit.