08 Tundra rear end noise

My 08 tundra, with 110k miles, is making low pitch growl sound. It’s noticeable starting at 45 mph, loudest at about 50mph and gets quieter after about 60. I believe it’s coming from the rear end. I changed my rear differential oil that looked good (no metal or anything). I’m leaning towards the rear axel bearings as this seems to be a fairly common issue. I’m just looking for some suggestions on how I can be sure that it’s indeed an axel bearing before getting to crazy with the project. What can I test to see if I have a bad bearing?
Thanks in advance!

 

Carrier bearing? Just a wild guess so I'm no machanic.

 

As far as I can tell when looking at the carrier bearing and everything within the driveshaft there are no issues with those bearings, but again I’m not overly sure as to what I should be looking for. I don’t get any movement out of the carrier bearing so I’m assuming that it is good.