my 95 3500 has 145000 on it and the other day it started to act up going in to overdrive. it has been serviced reg and is the first problem that i have had with it but i went ahead and changed the fluid and filter yesterday with no luck it still seem to run up to 50 befor it will go in unless i let up on it then it will go in and lockup no other problems in 1-2-3 goes right up threw them nice once its in its ok. any help