Guys, I get this whistling, whining sound when im driving, no matter in what gear/neutral and is speed dependant ie the pitch of the noise will change depending on the speed. It's not a huge noise...radio will cover it but it's farking annoying. I've been directed to rear transmission bearing...now anyone has had the same problem? how much it costs? is it necessary to do?

i'll add that i drive a stock my00

cheers