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?


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