I've allways been satisfied with Die Hard batts. But after shopping around, I went with Interstate's the last time. When I pulled up to the Interstate battery distributors, there were 3 Ford, and 2 Chevy diesels parked in the lot.
The salesman walked me thru a couple of choices, and then suggested a new heavy duty battery that Interstate had devloped. I looked, and it said 875 CCA. I said that wouldn't be enough for cold mornings. He said "That's whats in my truck", as he pointed to one of the Fords outside. Then he took one of the batts off the shelf, pealed the plastic off it, and hooked it up to the load tester. It read a steady 1100 amps with the load as high as the machine could produce. He looked at me and smiled. I knew right there that the battery was waaay underrated.
Heavier plates, case, terminals, 2yr free replacement,5 yr prorated, and within $15 of the recomended battery for our app. I was sold right there.
With these batts, new Nipondenso starter, and batterycables.com cables. I bet I could drive my truck to town, with just the starter!