Im not sure what's causing this noise, it started today. I also had what felt like a transmission slip but perhaps my tires just spun when accelerating. It sounds like pulley bearings or belt to me but I'm not sure. Anyone have any ideas?
video of sound: https://youtu.be/4NPdX8nrwZg?si=5st2CUGAgaMiHr-M

 

Maybe a bad alternator? Take off the belt, start it up, don't run it long though... see if the noise is gone.

Welcome to DF!

 

Yeah, Im going to have to wait a couple days to get an open spot in the garage but as soon as I start messing around in there I'll keep this updated.

 

So I changed the Tensionor Pulley and the belt and it was still there, turned out it was the AC clutch. I don't have the equipment to fix that unfortunately, I know I can rent the vacuum and all but as I've never done it before, I didn't want to take a risk. I had it quoted at a few places. Firestone wanted $2,453, Flynns wanted $975. Big gap and I couldn't let it sit forever as using my truck to get to and from work is about $120 per week, I needed it going ASAP. The compressor from every auto store nearby was about $640, plus belt, getting the freon drained and refilled after done it was about the same to have them do it compared to me trying (and probably failing). But it was about a F3-Gb note (just under 400hz) squeal with another around 2.4khz. After changing the Tensionor it was just the lower pitch so I think the higher pitch was the pulley, and the lower was the AC compressor. One thing I learned is different frequencies tell you different things so I'll keep this in mind and if anyone else hears those pitches (there's sine waves for those frequencies on youtube), a compare isn't a bad idea to try.

I'll keep the video up incase anyone else runs into a similiar issue.