Back in the day i used to drive a big ford flat bed truck where the power
steering pump whined a bit when I turned.  Does this sound about the same.
By the way, it was particiuarlly noisy when you really cranked the wheel
to it's extremes.

This may help- it may not.

Matthew Pollard             http://www.uidaho.edu/~poll7356
Dept. of Chemistry               http://www.chem.uidaho.edu
University of Idaho                   http://www.uidaho.edu