Demolitionman
TB Veteran
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None of the companies that have messed with the speed of their trucks have taken into account the rear end ratio along with the final ratio of the transmission. Depending on how they ordered them, you guys very well could have gotten great milage at 75 vs. 65 b/c at 65 the trucks were bogging down into the lower rpm. I'm curious about it myself.....if someone could give me the rpm you run at 65 or 68 and the transmission model #, I could tell you the rear end ratio.