1,2,3 r ok but when its time to come out of 3rd i can tach 2500 and it still wont shift i have to let off it a little in order for it shift, then it goes for just a bit then od kicks in. This is my first auto so i dont know much about them. Any advice would help thnx.

 

https://www.dieselbombers.com/12-val...ears-what.html

 

check your tps mine was bad and it didnt even throw a code