power steering pump?
 

Ok i just replaced my altenator and i didnt switch the pully yet i have underdrive pullies. Now my car started making a weird sound comeing from the belt/pullies and i looked under the hood and power steering pump pully looks like its moving alot slower then the others for some reason. Does this mean i need to replace the pump? Or you think its just the pully i didnt put on yet for the alternator?