Vibration in drive train

A rumbling vibration developed in the drive train at 45-65 mph. I first noticed it a few years ago but it was so subtle that I dismissed it because I live 3 1/2 hrs from the nearest T dealer. It feels like it is in the drive shaft or some other part of the dr. Train. I'm still under the warranty since the truck has under 34,000 miles. Hopefully it is covered

 

What year, drive, cab, engine?

 

Sorry, it's a 2012, four door, 4 wheel drive. Auto , V6 Thanks. Hope you have some idea what might be wrong especially since I was told that Tacomas are prone to vibrations in the drive train

 

Stock? Lifted? if lifted how high?

 

Stock

 

I had something similar. It sounded like I was driving over a rumble strip but I didn't really feel it, it was just a loud dull noise.

I suspect it was a bad carrier bearing but they replaced the entire driveshaft under warranty and it fixed my issue.