this is what i got back from ZGP this morning: The output is 2000 ppm per mile. You can also get a speed from pin 16 on the transmission connector

 

 

I did run an extra pin from 16 on the tcm but haven’t tried hooking it up. I will try tmw and see if I can get it to work.

 

So I tried running a wire from pin 16 on tcm to the high side, low side even the cluster speed circuits and nothing. Debating on dropping the pan and trying to wire into the speed sensor🤔

 

looking at the diagnostics for the speed sensor on the 6l80, it looks like it generates a 8.3-9.3V signal and the one on the GMT800 for the speed signal is something like a 5V signal.

on my truck when i had the sensor unplugged at the T56, it would give a rear ABS DTC

I dont know if that helps any or what to do with that information but there it is.

 

@Alanis001 how did you handle your Park/Neutral Safety box? Mine does not fit to the side of the 6l80. Run new wires or tap?

 

https://sirhclabs.com/product/cortex...ensor-adapter/

Possible solution, another module but it looks simple

 

Dude is local to me! Maybe I can do some networking

 

Maybe you could just like, I don't know, do your 6L80 swap and drive over there yourself and ask him

 

That sounds like work. No thanks

Plus, if I don't have a speedo.... I might get a ticket. Oof