when i have my car on full lock and turning either forwards or in reverse the car almost seems to clunk and jerk forwards or backwards depending on which direction im heading. I doubt this is to do with the lock stop bushes though they probably need looking at. does this sound like knackered ball joints? the car has always done this over the 4 years ive owned it and has never failed a yearly test. could it perhaps be anti roll bar drop links? as i dont think there a tetable item