I have an awful noise that my usual shop cannot identify. They said they put a stethoscope to it but no luck.
It's like a grinding type noise that happens as soon as I turn on the car. It's not always present but it's noticeably worse when I'm on the highway and let off the gas. It's so bad that the rear view mirror vibrates when I'm going fast.
It sounds like it's in the front of the car on the passenger side. I somewhat suspect it's the transmission but that's only a guess because I know my shop didn't check that out.
Any ideas before I spend too much on diagnostics?