[Mnguy]

Fluid wouldn't have any effect on that, only the effort needed to turn the wheel. Are you absolutely sure that the input shaft to the gear box is turning? Either the end of the steering shaft is spinning on the input, or the output shaft is slipping in the pitman arm ( if it isn't lined up with the offset notches it won't seat on the splines) . Have someone watch the Pittman arm while you turn the wheel.