i have a 2004 dodge durango 5.7 hemi and my transmission thumps when i come to a stop and when i push the tow button the thump takes off also my speedometer
when i drive a hundred miles miles it said i drove 60 miles
i changed all sensors that are outside the transmission which are 3
is it the solenoid pack?

 

If I remember correctly the solenoid back is attached to the valve body. A thumping I would think is a mechanical concern. If the sensor for mileage pick up is on the output shaft and you mileage that you get is of I would think the concern is in that are of the trans. How is your fuel economy and how does the truck drive?