I have a 2011 F-250 FX4 6.7 diesel 6-3/4 bed with the 10000 GVWR package and 3.55 gears. With it loaded traveling on the interstate I had to consciously monitor my speed, to keep it below 70. Hills did not seem to be a problem either, went up 4% grade and had plenty of power to go faster. If...
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