Tranny question Bill?

[Tholt34]

2000 year truck, stock tranny, php tunes, does it whether chip is on the truck or stock. Tranny fluid smells fine and is red ad not burnt. Its never been overheated. It almost feels like it go in between gears. My converter isn't dragging, I know what your talking about there but thats not it. Why is the scan tool telling me that my pcm is reading my truck in 2 when its actually in first and then when it shifts in overdrive the scan tool says it is invalid.