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Very high pitch squeal only at idle
Truck is a 6.4L 08' with 107k miles, intake, exhaust, tune and dpf delete.
When I start the truck I have no audible noise and everything sounds good, then after warming up 3-5min I'll get a VERY loud squealing/tea kettle noise only at idle. Once I start driving it goes away and then starts back up after I stop and idling for a couple minutes.
Things I've tried:
Turning on the A/C compressor on/off and no change in pitch.
Spraying WD-40 on belt trensioner, no change.
spraying belt dressing on belts, no change.
spraying water on belts, no change.
Anyone have these symptoms and found a solution?