I just purchased a 2006 GMC sierra flood truck with a 4.8L in it. The motor is bad along with some of the electrical parts (ECU,BCM, etc...).

I found a 2004 Silverado with a 4.8 and 35,000 miles that I can get the whole truck (it has really bad rear end damage).

My question is what years use the same electrical components?

Do the 2004 and 2006 use the same ECU, BCM, and wiring harness?

Thanks Greg