So if starting from scratch with a 5.7 ls1 and 4l80 trans. If I buy a harness is it better to get it for the 4l80 .. have heard of converter issues and to go different route. So opinions please.
Do I get a 4l60 harness and figure out the relay mod. And have tuner work around it.
Or do I buy the harness from frost that does the switching for you and no tuning Issues. Or just go with harness for 4l80. Thanks guys.