1991 XJ6. When I drive over bumps I hear a loud noise that seems to be coming from the back area of the car. It is a deeper flat banging sound. Not high pitch or squeaky. I’ve had several mechanics look at the car but no one has been able to tell me what it is.
Could it be shock or strut or worn bushings that are not easily accessible? Has anyone had this problem? Pushing on the back of the trunk and shocks appear to work properly. No bouncing or resonating. Car rides well. Just that banging noise over every bump.

Any ideas? Thanks to all.