The car is running perfectly no abnormalities while idling, driving etc... My bov is stock, dont know if that matters but just so yous know.. As for diff I dont know about it never heard diff clunks. Im pretty sure that the noise came from the engine area. Im starting to think that its the bov under heavy pressure? anyways service is due in couple of weeks so Ill make sure I get everything checked properly, still 1 year of warranty thanks guys...