Hello, friends! I have a big problem .. My Passat FSI 2009 is six months with the traction problem. I had to trade three trizetas and refurbish two tulips, the latter is new. Everything was revised. Since the wheel bolts to the axle shafts, seals, hubs, etc. .. A mechanic told me that there is only problem in differential. Or the ring may be in bearings? He was able to greatly decrease the vibration on acceleration, especially on curves. Typically difirencial problems occur in rings and bearings, because they are made to this?