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You could very well have a bushing<s> that have worn out in the rear control arms or the rear strut rods or both. This would cause a noise and also make it feel like the rear is shifting from side to side a bit and very well make the rear tires wear incorrectly causing premature wear. I would also suggest that a 4 wheel alignment be performed after the suspension and tires are back to 100%. see diagram. Thank you, jim