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Power Strokes
6.4 Aftermarket
AKF250 Alaska Build - (650-700HP BUILD)
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[QUOTE="sootie, post: 1503055, member: 8162"] 2011-2012 trucks came with 3:31 from the factory...not sure on the od ratio in a 6r140 off the top of my head though. I ran 3:55 and 35s on my 2010 6.4 and it was fine. I wouldn't do 3:31 personally as you are lugging the engine and straining the drivetrain more than necessary. Will be smokier off the line and if you do much in town driving, mileage will be terrible. [/QUOTE]
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