I deal with this one all the time. Don t worry, more than likely not an internal trans or converter issue. Start with a throttle position sensor. Chrysler part #4882219, cost about $40. This is a potentiometer like your fuel guage. The harder you press on the throttle the higher the voltage reads from the sensor to the computer. The computer uses this info to know when to lock or unlock the converter clutch. If the sensor gets a weak spot in it at just the right position it will drop voltage and the computer will command the converter to lock and unlock as the voltage spikes up and down. Because you commonly drive between 55 and 65, that s where the sensor wears. The computer will virtually never throw a code because it just thinks your foot is twitching like crazy on the gas.
I m not big on just throwing parts at something, but because it can be intermittent and the voltage drop is millisecond fast, it will cost you more time and money to hook it to a lab scope and find the glitch than it will to just replace the sensor.
Start here anyway, there are other causes for this, most of which are electrical. IF the TPS doesn t fix it let me know, I can give you some other things to check. Good Luck BW
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