Under hard accelleration the tranny shifts with hard clunck or around 4500 rpm does don't want to shift but jerks or surges a little in 2nd. Speedo reads high after that until you turn the car off and on again. Funny thing is if I floor it when not in over drive 'regular D' so it only has three gears everything works fine. Is this my VSS or is over drvie shot in the tranny or something else going one. Car has 100K on it but I would like to get away with one more winter with out sticking major money into it. Otherwise I am shopping for a new bull or an Edge maybe.