What is loud rattling thumping noise from left rear at 40 MPH and above

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mechanic has replaced left rear wheel bearings,rear strut assemblies and mounts(found right rear strut was broken),drained and refilled rear differential oil replaced Left rear wheel bearings,4 wheel alignment,and replaced 2 rear lower steering knuckle Control Rods. problem still exits when acceleration reaches 38 mph and above, diminishes some when braking, no thumping when traveling under 38mph