Hey guys, I'm new to 355 Nation; I've been finding your info really handy over the past number of years, but I never got around to joining until now. Anyway, I plan to do a V8 swap into a 2006 Colorado 4x4, but I have been having trouble figuring out exactly what parts I need for the swap. I plan to use a 5.3 with the 4L60E that came stock with the Silverados, and retain my 4x4 system if at all possible. Now; can anyone make up a definite list of things that I need to make this swap work? Obviously CPP motor mounts, electric fans, a redone wiring harness, etc. But what about the throttle system, the transmission control system, and which ECU I need? If someone could tell me bluntly what parts I need to get around, I would be very grateful.