So it kind of sounds like, according to this thread, that it's either the heat shields, or my transmission and no one has any advice on how to diagnose the transmission. SOOO, just drive it until something breaks? LOL

 

I guess. If you have no more questions and that's the best you can come up with. A video would help, but that's already been said.

Good Luck!

 

As I've said before, this is not the belts or any pulleys as I removed the belt and the noise still happened.

 

Stethoscope it with something. I'd start with the PCV assembly, just pull the valve real quick. Work down to the heat shields if you don't find it before them.

The heatshields on the upstream cats. You wrap a 7 or 8" band clamp around them (Per Ford TSB). I used a couple clamps on each. Mine were chirping like yours, like your sound but a little more drawn out. It was the worst sitting in the drive-thru line for coffee every morning. You know, with the truck in D/foot on the brake. Lookup "Ford heat shield fix". Or Ford heat shield TSB.

 

I did check the PCV, it was not that.


I guess I will check the heat shields. The only thing is the noise is not constant. It will make this squeal for about 2-4 minutes upon startup and only after the truck is warm. The longer it sits after being warm, the longer it squeals. I.E. if the truck sits for five minutes after being warm it'll squeal for ten seconds, if it sits for an hour it'll squeal for 2 minutes. If it's dead cold it wont squeal at all.


Very confusing.

 

Makes perfect sense to me. Well, a theory that has proved true. Spot weld has fatigued and broke with age. It squeals or chirps once conditions are met. At a certain heat level or perhaps two different heat levels. Gets worse with time. At a certain temp the shield warps away from the spot weld enough to create a difference in pressure against. That's when vibration wins causing friction/movement between the two mating surfaces. Thus the noise your hearing.

 

Well, I will be looking at the heat shields. Would I be able to physically see the damaged spot welds?

 

No.

 

just a wild *** guess, but the video kinda sounded like an exhaust manifold leaking to me, only more squeaky and less ticky like they usually are. is it definitely coming from under the truck or more under the hood on the backside of the engine?

 

Definetly not a manifold leak "according to the sound clip" sounds more like a heat shield to me. Something loose and rattling for sure.