Thanks for all the suggestions. I put the tires back on and dropped it off the stands to take it to a friends garage and... it stopped. No idea why. Drove around and she works fine now. Super strange. If it happens again I'll update, but this is the second time its happened like this and jacking it up and dropping it down also make it stop the first time. Today was much louder than the first time though. It must be something very specific that I do that triggers the problem in my exact car, because as far as I can find out no one has seen this exact problem in the way it occurs for me.

Who knows. Our suspension is pretty stiff, could just be that it gets bumped into a bad spot and just needs to be knocked back into place. That's the best I've got for now.

Wish I had a clear answer for this but I won't complain with the result I got.

Thanks all.