Rear axle/differential noise

I’m doing a ton of research to narrow down my problem with the rear axle on 2003 Toyota Tundra SR5 v8 4wd.

Toyota dealer says the noise is from the differential.. I felt I was being blown off and there wasn’t a real diagnostic done. I will put link to the video I took today. Please any help or advice is greatly appreciated.
https://youtu.be/gujrpIHwI3s
Thanks in advance.

update: turned out to be passenger side wheel barring.

 

Looks like a bad bearing on the pass rear. Hows it sound in the cab between 20 Mph and up? Like an intermittent wha growl that rolls thru the cab? Wha. Wha wha. Wha whaaaaa wha waaa. Wha.

I had a noisy rear driver side. Side play wasn’t near what yours has. Recco you find a shop that knows EXACTLY what they are doing and replace both rear wheel bearing. Use only New Toyota Axle Seals.

 

@Professional Hand Model
Thanks a ton for the reply!! I would say in the cab it’s overall constant and as you accelerate it doesn’t necessarily get louder just more rapid sounding.
So you’re pretty confident it’s not the differential?

Thanks Again!!

 

Not confident. Can you make a 30-45 second video from inside the cab while you drive at speed from 20 up to 70mph. We had a member do that last year and it sounded EXACTLY just like my bad bearing.

That rear wheel play is significant. It even wobbled when you had it in drive.

 

I can't really tell what I'm supposed to be hearing. At one point I thought heard a knocking sound and another time it was different.

 

More inclined to think wheel bearing/axle... wobble is not normal. Perhaps that issue has led to an additional diff noise, but in any case... put the effort into a proper diagnosis. A rebuild of the axles and bearings may be in order, unless you do a rear axle replacement.

 

Check your brake adjustments also. Grease all your zerks. I do hear the sort of rumbling noise in the portion of the video that's pointed at the third member, and directly at the hub. The thing I find odd is the rear tires are not spinning together. Drivers side appears to have a lot of drag, like improperly adjusted brakes. Check that.

Edit: Just watched the end of the video. I would be inclined to think there's trouble in the rear end with that much lateral play in the hub.

 

Yea you've likely got something pooched in the 3rd member. Without pulling it apart there's no way to tell for sure what the issue is.

Assuming your axle shafts are still good you could either source a used 3rd member or do an exchange like this.
https://eastcoastgearsupply.com/i-788575-tacoma-8-4-non-eld-t100-tundra-3rd.html

 

Alright I definitely had to adjust the drum brakes they were way to tight. I greased all zerk fittings the best I can. Changed the differential fluid. Definitely gave some improvements overall but still have the tumbling rumble sound going.
I took a video on the highway today to try and capture the sound and it’s barely coming through in the video.

 

Did you find anything scary in the fluid? The drain plug has a magnet for capturing metal.

 

im definitely a complete newb to this but I would say nothing rediculous. ‍♂️

 

That grey sludge is normal. I don't see any metal shavings on the magnet.

 

A Burgeoning Hand Model.