Hello,
I have a squealing noise in my front end that is only noticeable when the truck is in gear starting around 1800 rpms, never makes the noise out of gear. It's a high pitched noise much like a belt sound. I've replace the idler pulley and tensinor, as well as the belt. I took it to a mechanic and he took the belt off and put it in gear and it still makes the same noise with the belt off. There is a obvious manifold leak that doesn't sound to bad. It also won't squeal unles the engine is all the way heat up. I'm lost on what could be making it squeal, anything information would be appreciated!!