Welcome to 2CarPros.
If it is happening when you release the clutch, the first thing I think of is the throw-out bearing aka the release bearing. Is that what was replaced?
Does it only make the noise in neutral? If you release the clutch in any gear, does it make the noise?
I attached a picture of the bearing I'm referring to. You may have to remove the transmission and inspect the clutch cover and input shaft to the transmission for something loose or a bearing noise in the transmission.
By the way, is there any way you could record the sound and upload it for me to hear?
Let me know.
Joe
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Sunday, September 15th, 2019 AT 4:41 PM