I had this issue come up a few weeks back and after doing some googling and nothing conclusive I looked the CVA over had new wheel bearings installed still had an issue and while under the car I noticed the u joint for the drive shaft coming out of the rear of the transfer had a shiny spot on it I grabbed the shat and can move it over a half inch the bearings on one side are shot , this is not a fix all for clicking coming from the front but if you are having this issue try looking at that u joint