I had my 2018 Tacoma serviced at 10,000 miles where I bought the vehicle, Titus Will Toyota in Tacoma, WA. I informed them that I have been hearing a whining noise coming from the rear of the vehicle while traveling at speeds between 40-60 mph, which started around 7,000 miles.
They looked and it and the service technician stated that he could hear it and it was "normal". This is not normal, so I had them look at it again during my 15,000 mile service. They stated that they couldn't hear anything, so I had the technician ride with me in the vehicle so he could hear what I was hearing. He could hear it and stated it was some kind of "harmonic resonation". When I received my invoice it stated that the technician said it was ""wind noise", this is not what he told me while driving in the vehicle with me.
I took it to another Toyota dealer and they used a chassis ear to determine the noise was coming from the differential housing where they found the fluid was dark and had metal debris inside. They contacted Toyota and after a few tests, were told to replace the rear differential.
I will no longer do business with Titus Will, they are not trust-worthy whatsoever.