Where does the sound come from?
If from the rear, BDC could be right.
If from the front, it could be a lot of things. One thing I would look at is your radius rods. I have found on a couple of cars where the radius rod come loos from the front crossmember. This would cause a clunk under braking, accleration and turning.
See the below diagram and ref part no 5 being the radius rod, and part number 21 being the suspect bolt.
