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Here are the rear suspension components, I believe this explorer doesn´t have rear ball joints, maybe the are called differently?
By the way, I replaced the upper and lower spring insulators about a year and a half ago...
Finally found the culprit, mount bushing (camera like) in the rear upper control arm. 2 Years ago I had to replace some bushings in the rear knuckle, Ford only sells the complete knuckle, so I purchased Moog. The ones in the knuckle are still good but both rear mount bushings (as pictured) were like this. I replaced them with OEM Motorcraft, they cost the same as the Moog. Suspension is quiet now.