Hi all, my car feel a bit rougher lately on not so smooth roads. I have new ball joints and drop links. Mechanic has checked everything and can't see nothing wrong. There is also more of a thud if u drive over something, say a cats eye or something. It's not the tires either as i've used the same brand as was on the car when I got it. It's not drastic or anything, but the ride before used to be silky and smooth and now it's not. Any thought's please?