I don't know about the grinding sound, but the knocking sound may just be the bolts are loose on the rack. Get a pry bar when the car is raised and attempt to push the rack back and forward. This was what mine was doing. If it is grinding but it is steering good, it may be the tie rods ends or actually the pump. Get under the hood and let someone turn in and see where the noise is comming from.
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Littleman
All stock and that's about to change!