1987 4/4. Mileage 142000 (new engine at 85000). Screeching noise (sounds like a pheasant being strangled) from roughly rear left wheel area when left wheel hits a bump. Obviously metal against metal. Given up trying to solve it - done all the usual checks - exhaust (usual culprit), tightness of springs/hangers. Wondering if it might be engine/gear-box mountings. Possibility of cracked chassis? Any help gratefully received!