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Once you put the bigger tires on it will make a huge difference on the highway. 4.56s and 33s don't get along very well on the highway. I did the same thing you did and felt the same way. Once I put the 35s on it was so much better.
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Lol, I figured that my speed had a lot to do with it. I don't expect to gain mileage when I add the lift kit and tires...just hoping to not have my truck be a complete dog and down shift on every hill. My end goal is to retain my 13-14 mpg average that I was getting before adding the gears, tires, and lift.
I've heard a lot of people recommend a SC 3865 as a future upgrade, what are the benefits of doing this first rather than a 206 h/o cam besides costs? I doubt I'll run a 91 octane tune, but it'd be nice to have that ability, and to remap my tranny.