Hello, these were very nice vehicles, and from what you posted you have already replaced both rear wheel bearings. Be careful with the instructions in the article that is posted. If you have access to a lift that is much safer. also make sure that the fluid in that rear differential is not burnt or very dark in color. from what you are describing it is possible that the pinion bearing that supports the pinion gear that is behind the yoke that the drive shaft from the transmission might be where you are headed.
Here is a link to the article that will help with this:
https://www.2carpros.com/articles/whirring-sound
Could you provide a recording of the noise so we could hear it? I hope this helps you find this and please don't hesitate to ask for more help and keep me posted with what you find.
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Friday, June 25th, 2021 AT 4:06 PM