2004 engine and transmission wiring harness for 5.3 6.0 ls1 etc. has transmission plugs for 4l60e and is setup for drive by wire throttle body. It has no missing plugs and comes with a set of new o2 pigtails THIS IS A GREAT HARNESS FOR YOUR LS1 lsx 5.3 6.0 conversions Please do your research before purchase. 

Any questions feel free to call or text 307258-2312