Ok, I spend a few hours this afternoon digging and searching and educating myself.
So the Dana 50 axle is setup with UJoints that are replacable. Found a ford parts online web site that shows them for approx. $35 each and also found some on Oreilly's web site.
The job to replace them is a "JOB" it appears when I found a detailed writeup on the PSD Superduty link that shows how to replace the Ball Joints. Exellent photos and writeup.
So will take a look more this weekend, but seems like to me, if the U Joints are sealed, there will be no way to lube them, but I will give it a try anyhow.
Fingers crossed as I don't want to spend the $$ at the moment for a major refresh of seals, hub, Ball Joints, etc while I am in that deep. Assuming that something might be worn and need replacing.