Chirping/grinding sound at idle and low gear

Hey y’all I’ve got an 07 Tundra SR5(4.6L V8) with an automatic tranny. Had a slight squeak/chirp/scrape sound at low speeds that came and went as I was accelerating. Changed the trans fluid and serpentine belt in the last 3-4 weeks and didn’t hear the sound for a few days. Well it came back and seems to be louder and now occasionally happens at idle, but only every few seconds. Any ideas on what to diagnose or check first? I’ve got a video of the noise, working on uploading that. Thanks in advance!

 

Take the serpentine belt off and rotate each of the pulleys by hand to see if any feel loose or if any feel rough as you turn them. They should turn smoothly and with a little bit of resistance. Even if they turn smoothly, if you can just spin them freely and they don't slow themselves down, that's a good sign that the grease in the bearings has departed.

Another check you can do is when you are getting the chirping, put the truck in neutral briefly and attempt to recreate the chirping. I would suspect that it will still be there, which would rule out the driveline as the problem.