FYI: For those with 2004 and older GMT800's, this will bolt right in if you are looking to swap to electric fans! If you have a 4.8 without rear AC, then you need this radiator and fans to do the swap as those came with the smaller radiator. If you have a 4.8 WITH rear AC, I'm not 100% sure if you will need this larger radiator or not. If you have a 5.3 without rear AC, I'm not sure if you already have the bigger radiator. If you have a 5.3 WITH rear AC, then you should already have the larger radiator and these fans will drop right in!
Thank me later.