2008 Tundra driveline vibration

Hello, longtime Toyota owner, first time Tundra owner here. Backstory, Just bought an 08 Tundra with 66,000 miles, YAY me right? Well, I knew it had a few issues, but I got it for $15,500 so I had some wiggle room as far as my budget. I noticed right off that the front rotors were warped, which is somewhat typical. I also noticed a low growl, that turned into a vibration at 43-47 mph. I called the local dealership and had them run the VIN to see if any recall work had been done, they said no, bring it in. Had the recall work done and had them identify the driveline issue. The tech said it was the right rear axle bearing, $450 for bearing+$3-400 for labor. I said thanks, but ill handle it. Forward to today, I removed the axle. first thing I noticed was quite a bit of gear oil came out of the axle tube when I pulled the axle. I was under the impression that there are baffles that prevent this, so do I assume that the baffles are bad? What is involved in replacing/repairing the baffles?
Next, do I take the entire axle assembly to the machine shop or is there anything else I need to remove before hand. I cant really see anything other than the speed sensor that could be removed.

 

Ok, thanks!