I have a 2002 Dodge Grand Caravan Sport. I have replaced the TCM, the Speed Sensor (twice), and my van is still messed up! It does not do it all of the time but becoming more frequent. When I accelerate The speedometer starts to jump shifts hard into 1st and 2nd and then it shifts ok once I get to 30mph. Check engine light kicked on again. IF it starts to shift fine with no jumping of speedometer from beginning everything shifts nice and smooth. Any suggestions? Last mechanic told me if speed sensor didn't fix needs new trans.