Changed all the fluids in newly purchased 00r the other day, car has 2700 miles on it, no signs of heavy track use... I'm getting a light to moderate clunk noise from the rear diff when starting from a dead stop or starting in reverse.... feels like way to much back lash in the ring gear. Did Ford set the car up this way? Saw video on the quarks of these cars.... briefly mentioned it. Has anyone else experienced this? Thanks