Originally Posted by
cobra30689
You didn't mention what you were using for cables (or whether you updated them), or how you have your alternator wired. When I swapped the 4.8 into my Jeep I went with a 600CCA, 75 series GM side terminal battery. Used a positive cable from a 1996 Fleetwood 5.7, which gave me 1 4AWG cable to the starter, 1 6AWG cable to the alternator, and 1 6AWG cable to the power distribution block. New 4AWG negative cable to the engine block with a 10AWG pigtail tied to the tub. She fired off instantaneously from day 1, and last week had one of the coldest mornings my swap has seen......+7 degrees. Might want to consider upgrading your cabling if you haven't done so.