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  1. 2016 will not stay in 8th gear + poor mileage

    RAM 1500 Diesel Tuning
    I drive highways a LOT for work. Whether I'm doing 80 or 65, the truck just does not wanna stay in 8th, and only stays about 20% of the time when doing 80 if I'm lucky, on very flat roads or downhill. When I'm doing 65 it is a lot better, but SOON as I start going up a hill, or need to give it...