Got a rear clunking sound going over even small bumps - reached under the car and when I hit it lightly with the heel of my hand I can hear it clunk. Both ends/locknuts are tight. Been on the car about 3 years. Is it possible I broke something inside it? I've already checked everything else I can think of...LCA's, torque arm, brake calipers, lubed, etc. Just wondering if they can go bad.