Noise from rear end on 3rd gen Tundra

^^^this, man.

I had two 3rd gen tacomas, one 4 cylinder and one v6. Both diffs whined when I feathered the gas pedal. Did it from day one until I (funny enough) traded each one for a tundra at 100k miles both times. You cant shake at stick at tacomaworld without hitting a diff whine thread. FWIW, it was a lot harder to find threads about diffs that actually failed. Most replacement diffs seemed to whine sooner or later, too, sometimes worse than the original. Good luck, OP, hope you got a solution that you're happy with.

 

So, is it a safe assumption that wherever Toyota sources their axle assemblies from doesn't know how to set up a ring and pinion gear?
Or possibly crap metallurgy?

 

Doesn’t explain the abundant amount of metal in the oil.

 

They just changed the rear differential. Hopefully it doesn't come back like some people are experiencing here.

 

Maybe old news but found this interesting:
https://constructionreviewonline.co...r-axle-production-plant-in-san-antonio-texas/

https://pressroom.toyota.com/facility/toyota-motor-manufacturing-texas/

2024 Highlights:

• Rear Axle plant groundbreaking with operations planned for 2026
  
  In 2024, Toyota announced rear axle assembly will begin at Toyota Texas in 2026. With this new asset, the plant will supply rear axles for the Toyota Tundra and Sequoia assembled onsite and the Toyota Tacoma assembled in Mexico.

 

Interesting. I wonder where the axles a produce now?

 

They are produced by HINO. They have a plant in Marion, AR.

 

Not for long.
https://www.autonews.com/manufacturing/hino-job-cuts-us-plant-arkansas-supplied-toyota/#:~:text=Toyota axle supplier Hino closing Arkansas plant, cutting 1,300 jobs&text=Hino Motors Manufacturing U.S.A. Inc,to local officials May 31.

 

Hino is owned by Toyota so it’s unlikely a quality issue at the plant.

 

Hino is Toyota's global medium/heavy duty truck manufacturing division.

 

My 24 at 18k miles starting doing the good ole howling sound right at 52mph. But don’t hear it at 70+mph.

 

My differential ended up being the cause of the wooooo noise from the back end of my '22 Tundra. They found metal shavings in the differential fluid and replaced the whole differential assembly under warranty.
More details here: https://www.tundras.com/threads/whine-at-40-mph-and-80-mph.125855/#post-3859964

 

Well, with 12k miles my dealer just installed the 4th carrier assembly. Three repairs + factory orig after Same noises at 40-45 & 75-80 mph as before. I am thinking it’s time to write Toyota and commence Lemon Law process

 

I'm sure the 5th assembly will fix it