Hi there,
This is a bit hard to diagnose from what you have reported. If the noise is there in park or neutral and constant with engine speed (or there abouts) I would be looking at an engine driven accessory or engine mechanical problem, if there when driving only it will be a transmission or drive line problem.
Start looking there.
Mark (mhpautos)
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Wednesday, January 16th, 2008 AT 3:44 PM