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Message: [QUOTE="punkrockford, post: 796847, member: 7436"] Just drove the truck from phoenix to Prescott valley. stock tune minus the dpf. truck would go up to 35-40psi of boost when going up hills and would stay at around 20-25psi when maintaining 75 up the hills. coming back down is would hold at 5 to 10. I don't remember ever seeing my boost gauge that high before. I am assuming its because the truck has to work harder to keep the speed up when turning 37" tires. Since i am without head studs I am worried about the boost being that high. it never really hit 40 but it was close. Not to mention i was getting about 9mpg. so I am thinking 4.10's or should I go to 4.56 i was keeping my rpm at around 2000-2500. based on this what do you guys think. I only want to put gears in it once. lol [/QUOTE]

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