There is a noticable shake/judder when the ECO switches between the cylinders. noted at most speeds but most recognizable around 60 MPH. IS this the tranny judder that everyone is talking about? It seems to shift well but I am mildly concerned. It was purchased used and has almost 50K on the odometer. Is there an extended warranty period for the tranny. If so, would it apply to a used vehicle(2007) purchase. Thanks, scott