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Visually inspect the upper and shock absorbers arm bushings for dry rot and collapsing. (On a leaf-sprung Pontiac, the front spring eye bushings and rear shackle bushings are checked.) Then, with the axle supported by jack stands, pry on the control arms near the bushings to check for excessive movement. A worn rear bushing will allow the differential to shift slightly during cornering and while going over bumps. Look for shiny areas of metal-to-metal contact that could indicate a faulty bushing or bent suspension parts.