I recently purchased a 97 Honda Accord and found out that there is a clunk/thump. This clunk is loud and you can feel the car kind of push forward when it happens. You can feel the thump under the floor board. I think it occurs when the car is changing gears. For example there’s a place on my road where it always clunks, so I put it down to D3 before I got there one day and, no clunk. But it doesn't just happen when I'm turning; it's basically anytime I slow down. Does anyone know what this might be?