2005 dodge 3500 dually 4wd-Having trouble transmission slipping in and out of gear. On take off get good 1 , 2; from 2 to 3 slips out 1 or 2 times then stays in afterthat. When slowing down almost to a stop it doesn't want to shift all the way down, kind of reminds me of my old gas truck when the tps went bad, don't know if this truck has one. Anyone know the problem