Probably not technically a ball joint since there’s no up and down motion, the only motion is steering. I’m surprised there are no grease fittings there on that old rig. I can’t remember if my old solid axle Jeep had zerks there or not. I do remember a lot of zerks…ujoints had zerks, 4wd lever, clutch bell crank (didn’t see that one until I had to replace the bushings inside!), along with all the other normal steering parts.
My 05 Sierra has zerks for the ball joints. I was kind of surprised.