when moves the front wheels synchronisation of the CV joints ingearbox is noissy on 2009 Kia Sportage

I hear krak when drive then. jack car front, shift gear 1 in and manually rotate the front wheels then I got where the krak sound is. right where the right/left CV joints meet in the gear box. the service interval is good. why, when this?

Asked by for the 2009 Kia Sportage