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I have a 2000 Exploder xls 4.0l vin x. I had the power steering pump and the rack replaced (i did the pump myself also 3rd pump since the problem stays the same and there remans). Now when at a rpm 1500 or above the steering wines like the pump is bad, but at a low rpm 500-1000 you can hear a pin drop. anyone have a idea what this could be? also if you look at/in the reservoir turn the wheel and raise the rpm's, while turning the wheel it looks like there is a vibration since the fluid will splatter real fine drops of fluid untill rpms come back down, or when the wheel is returned to remove any pressure. the sound is like a combination of grinding and your normal steering wine when the pump is bad. i believe all air is out of system, i checked it multiple times and the fluid don't foam or show signs that it wants to
It sounds like there is still air in the system. Fortunately I have not had to fight this, but I've read of others here who have. You should search the forum for keywords "power steering". I seem to recall some filter that could be the issue as well, but I don't recall what years that was used on.
For years I thought it was the pump. Turned out to be the idler pully. I have '98 5 liter, so it might be different than yours. But it was at the bottom left,no tension spring. Sounds like a new motor now.