I have read on some old posts from 2009 about the 2nd gear synchro going out causing the grind from 3rd to 2nd. Most replies said to just double clutch to solve the problem, which I am doing. I was curious though if this will eventually wear out the transmission. Has anyone replaced the synchronizer? My insight is a 2006, has 166000 miles and batteries that were just replaced. Sugestions?