Well just in case someone might stumble on this post with a similar situation, I 'll post a very late discovery of the culprit.
Turned out to be the plastic rear sway bar connectors. Lack of lubrication in the knuckle joint was making the clacking sound. Just by sheer coincidence I happen during the rainy season had a washout on my long downhill driveway (a 12" 20' rut was created) one sat morning going out the left rear in the gully the right above I heard a 'pop' stopped to check things out no sign of anything out of place or broken, continued on. Upon making a left sharp turn around 20mph a scraping sound now was audible along the clack. Inspection for the scraping resulted in discovering the left rear connector being broken.
Replaced both linkage connectors and gone was the clack and the new scrape
Thanks to all who suggested input.
A.