I recently replaced my two engine mounts and two engine shocks on my 1984 300TD. After I replaced them, I expected less noise and vibration but what I got was a slightly loud noise like metal vibration coming from the engine well somewhere. I'm suspecting that I also need to change the transmission mount, but after a visual inspection it looks fine and I have decided not to change it.

Does anyone have any ideas why I would get a slightly louder vibration sound coming from the engine well after I changed my engine mounts and engine shocks? Thanks.