diagnose that sound

Hey! This is a 1997 2.5l with about 117k miles that I bought with little to no maintenance history. I think that I'm having issues with some timing chain noise, and something to do with spark, but I'm not too sure. It is running a smaller serpentine so that the AC isn't connected to any of the...

I've got a 2006 TJ 6 Speed Manual 4 Liter Jeep. She just started making a squealing sound from the underside. I took a short video that I'm posting. Does anyone have any input as to what that sound might be? Thanks in advance.