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No matter how much power your truck makes, it isn't any good unless you can put that power to the ground. The 5R110 transmission from Ford has backed both 6.0L and 6.4L Power Stroke engines and is generally considered to be a pretty decent transmission. But like anything else that's stock, there's always room for improvement to handle bigger power output.

Back in 2008, Chris Mollo of Napa, California, bought himself a brand-new, fully loaded GMC Denali that came equipped with an all-wheel drive drivetrain and all the bells and whistles. It was perfect in its stock form, but no true gearhead can leave well enough alone.