Having read where all these different clunking noises come from, in my case, the clunking increases as the car goes faster, the fact that the road surface is rough or smooth seems to make little difference, only speed, at crawling speeds, the clunk will be rare but loud, once 20 mph has been reached, the clunk seems quieter, but faster..... then there are times that the noise seems to disappear, whether turning or driving in a straight line seems to make no difference either. Being in a built up area or out in the countryside doesn't seem to make any difference, I was thinking that sound was being thrown back when passing a wall, but after driving 30+ miles with the window down, it doesn't appear to matter...... it is very strange