Welcome. Not sure if you have done this already, but synthetic oil at your next oil change might be a consideration. Two differentials, a transmission, and a transfer case all spinning makes for a lot of sources of friction, you may consider servicing them with synthetic fluids next time they are due as well. Being a regular cab with a 5 speed, I am guessing your truck has steel wheels, not alloys. If your windy rural driving has a lot of stops, finding some used factory alloys might be something to look at. Reducing your un-sprung rotational mass would help with a lot of stop & go driving. Used factory alloy wheels are probably fairly inexpensive, being the first thing someone usually takes off when they decide to mod their 4x4.
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"Don't look for one place to lose 100 pounds, look for 1600 places to lose an ounce." - Tony DeFeo
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