Driveline noise

Greetings,
2019 Tundra TRD Limited trim.
76000 miles, Has speed dependent "moan" that I recently noticed. The sound is heard loudest between 40-43 mph either on acceleration or deceleration. I think I am hearing it around 60 mph as well. Any ideas? (Driveshaft hanger bearing, axle bearing, U joint).
Regards,
bc

 

Is it a sustained sound at speed? From the front or back? Could be diff, have you changed the fluid regularly?

 

Sounds like the back. Yes it is constant frequency and yes I have change gear oil. First time at 13K and again at about 70K.
bc

 

Did the oil smell burned? How was the metal shavings on the plug?

 

The oil was a little dark the first time (factory fill) but looked new the last time. No significant metal on magnet. It is not very loud and gets masked by engine and road noise on acceleration, but is noticeable on deceleration. May be tire related.
Thanks,
bc

 

Is it 4wd? That’s the general speed range for the front diff needle bearing failure.

 

It is. Putting in 4wd H doesnt help.
bc

 

Any lift or relevant mods?

 

None. It will have to get louder before a good diagnosis can be made.
bc

 

Update. The noise is no louder than before. Can be heard at 30-33 mph and 40-43. I checked the temperature of right and left rear bearing housings and both were 114 degrees after a 30 min drive. Temperature in pinion bearing region was 134. How do these videos get the sound of noises? Thanks.

bc