Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
This is not going to be easy. Not only do you have to replace the wire harness, you will also have to replace the pcm. The pcm for this truck with the 4l60e trans can not be used witht he 4l80e transmission.
Do you have access to the other truck to remove the pcm and wire harness out of? Did both trucks have the same size engine in them? What year truck did the 4l80e trans come out of?