I purchsed a wiring conversion and a tune from a guy to put my 98 L31 in my old truck. Now it will not shift. The trans shows that it is commanded in first gear all of the time. No matter what gear it is in it still says 1st gear is commanded.

Does anyone know if there is a pid for the pnp switch?
I also read that the 4L60e acts like a hydralic trans in any manual position except D4. In D4 the trans uses the solenoids to shift the tranny.
So in my case the trans will not shift and it just seems to slip in any gear position.

So is the trans supposed to shift by itself if it is not in D4?

And finally, if you tune with efilive does it change the way the trans operates? Or the way the PCM sees the trans? It will start in any gear and if I unplug the PNP switch I get no codes.