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forget a tuner, with the 4x2 and the 3.55, go with a gear swap, 4.10 will make the truck scoot, what you spend on a tuner if they ever make one for the truck, you wont be as happy as a gear swap
I may have to price that out too. The list is going to be long. One of the reasons I want the programer is also to set up the computer which I will have to do for the tires and diff if or when I do it.