I would suggest the replacing and checking the plastics. HB plastics are very good IMO but just like everything they do wear out. I have run a number of cars and after 6 months the car just needs a fresh rebuild. For the CVD's I grease them with moble 1 synthetic grease before every race and have not had one fail. As far as the other stuff that is breaking it sounds like where you are running either has some really big jumps or is really rough. Did your Fuel tank crack??? cause alot of time its just the fuel line inside the Clunk..