This is a dodge caravan question. My family 95 caravan shakes A LOT between 40 and 45 mph. Enough that my wife won't drive it anymore. Works fine through 1st, 3rd, 4th gear (AUTO TRANNY), but when it get's to 40mph in seconed gear it starts to shake the whole van until about 45-48mph. The tranny was rebuilt about a year ago and we haven't had any problems. Any clues???