Thanks for the answers guys. My wheel bearings seem to be ok, but there is some noise coming from the rear end, what seems to be from the differential itself. When accelerating there is noise, but when coasting there is no noise. I did change the fluid some months ago, since I didn´t knew when it was done before, and it was looking good. Since the pinion seal also has a slight leak, I will be opening up the diff and see how the pinion itself looks. It could be that a pinion or diff bearing is causing the noise.
1958 T-Bird "Trovão Rosa" - "Rose Thunder"
Thunderbird registry #61670