99 K2500 CCSB LY6 Swap

[gmech]

Originally Posted by clinebarger

'09 LY6 P/N input diagram. The TCM/Internal range switch in the 6L90E sends a ground when the shifter is in Park or Neutral.

Thanks, but I am reusing the 99 4l80e. Just let me know where to send the check! I really mean that. I have more questions that I am sure you could answer or provide diagrams for. I'm really not as stupid as I seem. I troubleshoot hvac controls on a daily basis, and I try to search for the info online prior to asking.

I kid you not, I've not accomplished a darn thing today except give myself a headache and raise my blood pressure. I put the whole pnp/nss on hold and began to wire in the gmlan serial data wire to the obd2. Only to find the following. I am going off 09 express ecm and tcm pinouts I found on gm upfitter, using a 09 express harness. The tcm has gmlan (+)(-) on pins 6/7,15/19 and 37/38. 6/15 and 7/19 are jumpered together. 37/38 go to the ecm x1-27/28.