Not sure if it goes here but I need some help. I currently have the 6.0/4l65 engine hanrness with the relay mod, but after some issues some of my wires melted. Can I pull the entire harness and purchase a 6.0/4l80 harness? The truck currently has the 4l80 in it with the relay mod. Any help please...this will be for a 06 Sierra dbw.

 

LSX Specialties is the man for LS wiring. He was helpful answering all my questions too.

 

Yes u can. Just get a dbw 4l80e harness. Make sure its the same crank signal as yours. As in older than 2007 harness.

 

Ok thanks I’m going to hopefully pick one up this week .

 

Has anyone attempted this or is a stand alone harness better?

 

You will have to have 4L80 segments swapped into the PCM to run a 4L80 with a legit 4L80 harness. Right now the relays are allowing you to run the 80 with 60 segments in the PCM.