I have a 04 wrx hatch, about a month ago i started to hear a whining noise. I thought it was a wheel bearing but the noise started to get really bad. Then another noise came into play about two weeks ago along with the whining, when i release the gas it sounds like there's something loose in the gearbox.
I took the car tothe mechanic he thought it my rear diff, took it to a diff specialist, he said that it was a bearing in the diff, he wasn't sure if it was front or back. I've just come back from a japanese gearbox specialist he says that there is a bearing/washer between the gearbox and centre diff that has shredded and is causing these noises.
Has anyone had or have a simillar problem or know what the problem might be??