1994 F body pcm for 1996 Y body obd II to obd I conversion?

[Lockdun1]

I used an original 95 y body bin as a base for the tune installed. From some reading I found the fault is from the pcm to the speedo. Not trans to pcm so I’m not to worried about it at the moment. I believe that the 95 cars just talk to the ccm differently and that’s what may be causing my issue. Maybe lol. Idk

[lionelhutz]

Yes, that code has nothing to do with the valve body or the VSS sensor. Did the speedometer work?

The code is referring to a 4000 pulse per mile VSS output on the PCM used to drive the speedometer. It's a pull-down circuit, basically an open collector transistor. It needs the speedometer to have a pull-up resistor for it to work. You've probably lost that connection - maybe the pin pushed out of the connector or was damaged?