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Are all the GM2 power steering pumps the same, as for mounting holes, pressure fittings locations and output pressure.
I've had two installed and both made a whining noise and I suspect less pressure than I need.
Am I correct in that most of them are copies of the orignal pump made by GM.
 

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i don't see why they would whine. GM has built millions upon millions of vehicles with those pumps over the years, and most of them are quiet.
 

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A lot of the whine problems can be traced to the remote reservoir and the feed hose going to the pump. The first obvious thing is to make sure that your 5/8 ID feed hose from the reservoir to the pump is not kinked or collapsed so as to restrict the free flow of oil back into the pump intake.

Also make sure that your reservoir is located above your pump so that there is a head of oil always trying to feed the pump.

The pump reservoir is a very critical part when it comes to eliminating very fine air bubbles from the power steering oil stream. All of the plastic Saginaw remote reservoirs have baffles and/or screens inside. A lot of people think that the screen is to trap small metal particles in the oil. This is not the purpose of the screen. It is to snare those very fine air bubbles and make them rise to the surface of the oil. If you don't have a reservoir that helps to expel the air bubbles, you will find that the air bubbles multiply and very soon your pump starts to make a lot of noise because of the entrapped air in the oil stream.

JIML82

I went through a lot of these remote reservoir issues with a fellow by the name of David Pozzi over at the Camaro Tech websight a year or so ago. http://www.camaros.net/forums/
 
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