So I have been trying to figure this one out for a while and im just stumped. The truck will go into reverse just fine goes into drive just fine but when i start driving its stuck in first unless i redline it and let off the gas then it shifts into 3rd replaced solenoids fluid was fine nothing out of the ordinary there. I have done a little research and seen stuff about the servo being bad or the 1-2 accumulator (i think thats what it was) any help is appreciated though