Gas mileage

Discussion in 'KJ General Discussion' started by Dane, Apr 13, 2021.

  1. Dane

    Dane New Member

    Messages:
    9
    Likes Received:
    0
    Joined:
    Apr 6, 2021
    What is the expected gas mileage gain re-gearing to 4.10's? I have 31'x10 tires with stock gearing. Is the increase in mileage and performance worth the cost to re-gear?

    Thanks in advance.
     
  2. tommudd

    tommudd Moderator Staff Member Moderator

    Messages:
    19,502
    Likes Received:
    1,128
    Joined:
    Jul 14, 2005
    Location:
    Southeastern Ohio
    The cost is worth it for sure when you figure in everything
    Power, running cooler, easier on your transmission, power, gas mileage
    Good example my 04
    installed 32s could not even run it without being in overdrive all the time,
    mileage dropped from 20 to 15 ,
    regeared ( using front and rear diff from a 4 cylinder gasser )
    went back to running cooler again, gas milaeage at 75 plus went back to 20.5 -21 easy and didn't have to use OD all the time
    Same thing with my 03 , 265-70-16s which are same height as your 31s ( 30.6 inches tall ) regeared to 4.10s using 4 cyl diffs again
    I get 20-21 easy on the highway, tows a trailer way better , temps stay at 197 all the time etc
    In my book it is worth it, of course I build mine for every day driving, off road when I want, or take off on a 10-12 hour cruise to somewhere warm and sunny with good drinks ! LOL
     
  3. JeepJeepster

    JeepJeepster Full Access Member

    Messages:
    8,636
    Likes Received:
    104
    Joined:
    Dec 15, 2004
    Location:
    Dem hollers in Ky
    If youre only worried about mpg, then no, not worth it.

    Worth it for all other reasons.
     
  4. tommudd

    tommudd Moderator Staff Member Moderator

    Messages:
    19,502
    Likes Received:
    1,128
    Joined:
    Jul 14, 2005
    Location:
    Southeastern Ohio
    Depends on how much you drive , 5 less MPG soon adds up for someone like me who drives a lot
    soon adds up
     
  5. JeepJeepster

    JeepJeepster Full Access Member

    Messages:
    8,636
    Likes Received:
    104
    Joined:
    Dec 15, 2004
    Location:
    Dem hollers in Ky
    I don't believe anyone else keeps vehicles like you and I.