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There has been a service bulletin for that type of concern. Here is what it states.
Bulletin No.: 10-02-32-002A
Date: December 20, 2010
Subject: Whine or Moan Type Noise from Power Steering System During Low Speed Maneuvers (Perform Repair as Outlined Below)
Some customers may comment on a whine or moan type noise from the power steering system during low speed maneuvers.
This condition may be caused by either low or contaminated fluid or there may be air in the system.
I have the instructions in a PDF format HERE
Also, the pulley from the original pump gets transfered to the new one HERE
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