Very faint Trilling noise

I have a very faint Trilling in my Tacoma (2023 sport double cab) I noticed yesterday. It is intermittent, more so at lower speeds between 15-35 MPH, can't quite figure out if it is RPM dependent, but I would guess around 2000. The truck is an automatic, but it sounds a little like a throw out bearing or a bird Trilling, higher pitched and quiet. I only noticed it because I was driving without music playing, which is rare for me. It's a truck, I assume it is going to be noisy and I can definetely live with it, just wondering if this is anything anyone has noticed before on their Tacoma. It's new and has plenty to go on the warranty, so I'm not that worried about it, just curious as I'd like to get familiar with all of it's normal squeaks and rattles. It does not sound like it is coming from the engine, more the transmission.