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I'm purchasing a new F-150 with the Ecoboost engine and I will be using this vehicle for work. I will be towing trailers and RVs across North America for long distances at a time. The only thing I don't know when it comes to vehicles is rear axle ratio and what it means. There are a variety of options I can pick from and I need help on figuring out which is the best option for the kind of truck I will be using. If you could explain why that decision is best it will help educate me as well. Thank you!
 

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The best way to go about finding out what rear axle ratio you have is by turning overdrive off so that youre in 4th gear (or whatever gear your 1:1 transmission ratio is). Then look at what rpm you're spinning at say 60mph. Measure your tire diameter and plug n chug. There's thousands of rear gear calculators out there online. You just need cruise speed, rpm, and tire dia and it'll spit out your gear ratio.

Hope this helps.
 

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my point of view after doing a good bit of towing.
get the 3.73

this is not the dark ages, you do not NEED to tow in direct 1:1 if you are running flat with only a little load, drop her into OD and be happy. When you hit a hill drop it into direct.

If towing is your game I wouldn't worry about the .60mpg you'd probably get from the 3.15
 
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