Run the WD diagnostic util on it and see if it reports any issues.
Has it always been noisy for the year you have had it?
I've found the WD Reds to not be too noisy.
I e had noisy drives before, Seagates which I complained to Seagate about but they reckoned they were fine, still have and use the drives like some 6+ years later and they are still working fine.
How are the drives mounted? You might be able to mount them with rubber/silicone washers which might help. I have a load of these which I got ages ago and where possible alway use them. If the drive mounts into a cage with screws in to the side it might not be possible.