XJ grinding noise

[Mike McDow]

I've had a grinding noise in my '99 XJ 4.0 for months. It is only present as I accelerate the first 2500 rpm. It does not come back unless the vehicle has sat turned off for a bit and then go again.Thought it was transmission, but that checked out fine. I changed the water pump yesterday, but the noise is back on my test drive. Any thoughts?

 

[superj]

put a long screwdriver on the alt and ps pump and put your ear on it to see if you hear any weird stuff. maybe a bearing is going out and when you accelerate, the extra power is pulling the shaft a bit over? well, first, does it do the noise in neutral? if not, you know its something in the drivetrain so you can then hit the bearings down there

 

[JPNinPA]

Like a steering pump going / growl ?