Faint harmonic ringing/hum coming from transmission?

I have a 2023 SR Double Cab 4x4 with 2,250 miles that I purchased a couple months ago. My Tacoma is pretty noisy which I pretty much expected. There are 2 distinct noises that have stood out to me. 1 of which I figured out was the LCA whistling. The other noise is definitely coming from my transmission. I am aware of the differential howl that some Tacomas make when feathering the throttle. This sound does not seem like that.

The sound I hear is a pretty constant harmonic ring/hum coming from the transmission area as I accelerate. It normally is most notable when I am accelerating from a stop, and applying somewhat aggressive throttle(3000 - 3500 rpms). The sound is still there if I apply what I consider to be a normal amount of throttle. Once I reach a constant speed, the noise goes away. If I remove my foot from the gas pedal as I am accelerating, the noise also will go away.

The sound is faint enough to where I can only hear it if the windows are up and the radio is off. I tried recording the sound and couldn't get the phone to pick it up. I could probably only pick it up if I had a GoPro strapped to the bottom of my truck while driving.

Does this sound normal? My previous vehicle was a Subaru Forester that had a CVT, so I don't know if it just has been awhile since I've driven at automatic and I am overthinking it. I also was wondering if the gears in the transmission just need to "break in" some. I have driven automatics pretty much my whole life, and I can't say I've heard these kinds of sounds before. I've also never purchased a vehicle new before..

 

Normal... similar noise in my 2022 OR and others will mostly likely report the same. I can hear mine on light acceleration in the 40-50 MPH range and not much under and above that range.

 

i know the harmonic/ringing you are describing. i think it's just resonance from the exhaust. the sound comes up between the gap between the bed and cab.

 

Needs more

 

I think you are right, that seems way more plausible than the transmission

 

My sr5 has always been pretty quiet, no ringing or howling of any sort. Maybe due to the 2 heavy coats of rp-342 cosmoline I sprayed on most of the steel chassis parts 3 years ago.

 

How do people hear all these special noises? I guess I’m just deaf as a block or my truck runs perfect.

 

I have been noticing the same thing in the 2020 I have and didn’t explain as well as you did on here but my ringing is also from stop and stops around 40 mph did you ever figure it out I been thinking rear diff

 

The harmonic ring I was hearing was definitely coming from the exhaust. I just started ignoring it but never did anything about it. I only would hear it when accelerating. If you are hearing a hum on deceleration, that may be your differential like you said.

 

I will listen for a hum when slowing down I appreciate it, hope it’s just the phone ringing sound I have to deal with