I am putting a 06 tb ss ls2 into an 03 Silverado, modified the harness to run drive by cable and the computer that I have is supposed to be capable of running either drive by wire or drive by cable. Who can I talk to so that I can get this thing tuned to run right with the cable? I wanna just get a stock ls2 tune right now and then once I make sure its running right I want to start putting a turbo on the truck.

 

you will need an 03 operating system in your pcm with essentially the "parameters" of a drive by cable LQ4 or Lq9 since it is basically the same displacement, AND those engines came out drive by cable from factory in the early 2000's. I can help you if YOU have HPtuners, i have unlimited credits for GENIII trucks so let me know.