After removing the knuckles off the ends of D44 beams are the ball joint supposed to turn/rotate? I assume they are, BUT how do you re-install them and torque them when they are spinning under the nut? My manual just sort of glosses over this issue.....

Load the bottom of the knuckle with a floor jack.

So the fact that my lower and upper ball joint retaining disc or whatever its called is welded shut to the knuckle with rust/corrosion and jacking on it would do nothing but lift the whole axle might be the problem? :(

Try an impact gun if you haven't already?

Load the bottom of the knuckle with a floor jack.

^^This. Use an impact if you have access to one like stated earlier.

Load the bottom of the knuckle with a floor jack.

So the fact that my lower and upper ball joint retaining disc or whatever its called is welded shut to the knuckle with rust/corrosion and jacking on it would do nothing but lift the whole axle might be the problem? :(

What rockslut says works really well. What you said doesn't make any sense to me at all.

They are trying to say that once there is upwords pressure applied to the knuckle (once the jack starts to move the axle beam), the balljoints will be forced into there sockets in the axle arm creating enough resistance for you to tigten the nut on each balljoint while holding the taper shaft still.

Thanks for all the help and explaination... I get it now... My peanut brain was confused becuase there is no coil or shock to provide resistence because I am just attaching the knuckle/spindle/Tire to cycle the suspension for clearance... I will either try to clamp it to achieve the same result or install the coil and jack it...

You can jack it up until the axle arm hits the crossmember, it doesn't take a butt-ton of pressure.