burg150xlt

Being new to the Ford world (and being as excited as a kid at Christmas to get m new truck) I neglected to look at the gearing. I ended up getting a 5.0L with 3.31 gearing. I rarely ever tow and never haul more than 1000 lbs of cargo. The only tire/ suspension change I plan to make is stay with factory size tires but go to 18" or smaller tires with 20" wheels. What kind of slow sluggish future am I in for? Be gentle I'm a newb

beakie

what driving do you expect to use it for most of the time?

if you have less stop n go, more straight/cruise/hi-way/longer drives you will probably love it.

city driving you may lose out on a few mpg's... but it's a truck, so it was never going to get little econo-box mpg's anyway, so enjoy it for what it is.

if you don't tow, or haul, much or often, drive it and enjoy.

burg150xlt

Mostly around town and local interstate. I just heard that the 3.31 gears make it sluggish an with considering going with a bit bigger wheel I didn't want it to get worse. Although as of right now still runs much better than my 2012 Silverado did!

Adobe2X

Did you really mean to say that you were going to put 18" tires on 20" wheels?
With that gearing, I would stay with 18" tire and wheels --- anything taller or much heavier, you will feel it in off the line acceleration and mpg.
As for carrying 1,000 pounds or even towing 4K or 5K, others on here have done so and reported that the truck does OK.

burg150xlt

No what I meant was go with a smaller tire size than stock like maybe a 55 on 20" wheels instead of a 65 on 18" wheels.

Coho

You will be fine with the 3.31 rear end. Your truck will still be almost on par for quickness off the line and when you 'punch it' while driving. You will LOVE your mileage.

sllydderrr

FYI 275/55R20 and 275/65R18 are the same diameter so any performance difference will be negligible.
I run 20's in summer and 18's in winter. No difference.

gregsf150stx

i have the 3.31.....nothing wrong with it at all. and its not "sluggish" at all.

kgpat

I bought a 13 Eco screw, 20's with 3:15. Just passed11000 miles. Love it! I don't tow but it dives great and power is unreal. Have averaged 18.2 since new.

Adobe2X

Just curious --- have you weighed the 20's and the 18's and compared them to each other?
A significantly heavier tire/wheel combination has quite a bit more rotational resistance and will affect your acceleration and mpg...........on a vehicle as heavy to begin with as our trucks, and if the two tire sizes are close in weight to each other, the difference may not be that noticeable though.
On a sports car we used to have, I went with a heavier, wider, chrome custom wheel and even used the stock tires -- but the heavier wheels made it so I could no longer break the tires loose as easily from a stop and they dropped my mpg about 1 in town and 2 or 3 on the highway....