Will an 04 Avvalanche 5.3l, 4l60 original harness accept an 04 2500 (8.3l/4l80e)? Is there any reason either physical or software wise that this might not work? Curious as I'd like to use this tune as my baseline starting point instead of the 5.3 or 6l and 4l80e. the reason is that I've become convinced its best to begin with ur exact model to avoid any inconsistancies - even minor ones that might be Avv specific v a general K1500 or Silverado SS...etc tune. Thnx R/