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. Just my assumption. Figuring higher speed - depending on how fast and the gear ratio. I haven't done the math on that. .

. Best to you on your gearing change. I would like to offer up the idea of balancing your driveshafts if you haven't already done that. You have to remove them to re-gear, so now is a prime time to do that job. And maybe replacing the universal joints as well since they will be spinning...

. Well said! A lot of truth in those few words too... .

. Gotta remember that this "Woke" crap has been around a long time. It just wasn't called that back then... Regulating speed was a consideration when these trucks were built. Private Snuffy could only go so fast as long as he was regulated. An awful lot like "back in the day" when Carolina...

. NASA's Dryden Research Center has dabbled in truck aerodynamics. See Attached PDF

. So - using just plain old common sense and logic @Awesomeness - I need to call BS on that thought. The trucking industry doesn't generally spend money on air dams and wind directors. If they did, they would have "field tests" done and then a group of ten (maybe) trucks outfitted with these...