esp660

Whats up fellas, I have an 05 xlt screw 4x4 and it seems to me i need a power steering pump. When i have the truck in Drive not moving and turn the wheel it makes a grindind noise, but when its not in gear a dont recall hearing it kinda weird to me, any one have any ideas as to what it could be? also im getting a really loud high pitched whistle noise when on the high way no clue what that is maybe its something to do with my issue??

Thanks- ROB