Have an 02 Dually with 5 year old batteries that I want to swap out before they start giving me trouble. Would like to know your opinions of what kind to get. Would like to get away from those leaking delco side post.-----Just installed Kennedy tune and 4 inch exhaust--- WOW!!!!!----- Some how he stuffed an additional engine in the PCM moduale. I think he needs to show the GM enginners how to progam PCM's.