I just got a triple disc converter, upgraded the valve body and got a red eagle rebuild kit. It was doing this before i got the upgrades, it would jump between first and second under light pedal. The guy that installed it, said he tried to adjust it out by adjusting a valve in the valve body, but he couldnt get it to go away. He said that it is just the way they built the valve body? Is this true? and is there anything i can do to fix this besides getting a better valve body?

 

Do you have any codes. I do not know alot about these trucks but from what I remember it sounds like it could be an apps sensor problem or tps problem which ever that truck has.