Extreme shutter after steering rack installed

I just replaced the rack in my 1995 EB Ford Explorer. I filled the steering reservoir and started the engine. The car is still up on jack stands. With a helper slowly turning the wheel I kept filling. At this point it took less than a quart.
When the wheel is turned you can feel it is very jumpy. If you turn the wheel fast the wheel violently shakes bake and forth, almost shaking the entire car. This would not stop so I quickly shut off the engine.

I checked the lines are connected to the correct placed on the rack.
What could be wrong?

I was just about to remove the return line from the steering radiater to flush the system.
Should I do this next or is something really wrong?

It was just air in the system. After I lowered the SUV and continued to turn the wheel it worked it out of the system.
All is well.