Hey guys, I'm new to the forum. I have been reading several articles on the forums and had a new questions. I would like to do a 5.3 to 6.0 LQ4 swap on our 04 tahoe. The engine just started knock and is becomming tired the high mile we have on it. I just found found a low mileage 6.0L (under 40k) with wiring and ecu. The wiring had been damaged tough during removal. Do I need the 6.0 wiring or am I able to use my existing harness with some modifications. Also which ecu do I use on the truck? Thanks guys.