I have an '07 F150 supercab with a 6.5' bed, 2wd with a 5.4. It currently has the standard 3.55 gear with a 245/70 R 17 tire. I pull a trailer pretty frequently and can tell that it's geared just a tad too high in its current form. If I was going to stick with this size wheel and tire, I'd probably just switch to a 3.73, however I intend to put a 20" wheel on it and run a 275/60 R20 or a 285/50 R20 tire. I'm thinking I would be better off with a 4.10 gear with that combination. Has anyone on here had a similar combination with a 4.10 gear? I'm curious about the "real feel" after you installed the 4.10s. I'm also curious about the effects it might have on the fuel economy. Anyone?

 

If you pull often I would go to the 4.10. My dads 03 F150 had 3.55 in it and was very unhappy pull a 20' car trailer. We installed 4.10 and the truck is much happier. Doesn't search for gears and even gets better mpg because it is not working so hard.

 

Thanks for the input. I suspected there might be a slight increase in gas mileage noted, especially when pulling a load.