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do you NEED to adjust gear ratio after tire upgrade?

Discussion in 'Wheels & Tires' started by forcepowrd07, Sep 13, 2009.

?

have you adjusted your differential after a tire upgrade?

Poll closed Dec 12, 2009.
  1. i have an upgraded tire size and lowered my gear ratio

    6 vote(s)
    8.0%
  2. don't plan on adjusting my gear ratio

    46 vote(s)
    61.3%
  3. haven't lowered my gear ratio, but i want to

    23 vote(s)
    30.7%
  1. Sep 13, 2009 at 9:36 PM
    #1
    forcepowrd07

    forcepowrd07 [OP] Member

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    hi everyone,

    I'm planning on getting 285/75r16 size tires and I read some where that increasing tire size decreases acceleration, torque, mpg, and overall engine performance. So considering going from 30 to 33 seems to be a pretty common thing on this site, is it a common thing to do after a tire upgrade?
    does anyone experience these performance issues after the tire/wheel change?

    I haven't found too many posts regarding this subject and I figured I'd ask since the whole re-gearing/differential-swap process seems really expensive.
     
  2. Sep 13, 2009 at 9:51 PM
    #2
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    FlimFlubberJAM
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    Anytime I change tire size by 10% or more, I change gear ratio accordingly. Its not "needed", but it sure helps. Plus, you can choose the gear ratio YOU want, not what the factory gives you. Most times, I get a ratio slightly lower (numerically higher) than OEM for better performance.
     
  3. Sep 13, 2009 at 9:52 PM
    #3
    gupster88

    gupster88 Well-Known Member

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    i didnt change mine, running 285/70/17's from stock 265/65/17's. usually once you go up to 35's you should get different gears
     
  4. Sep 13, 2009 at 9:53 PM
    #4
    MsTRD

    MsTRD hell yes i love my truck

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    i've got 285/75/16 km2s and i'm not happy with the mileage drop so I plan to regear as soon as i can get the money together.
     
  5. Sep 13, 2009 at 10:02 PM
    #5
    forcepowrd07

    forcepowrd07 [OP] Member

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    yea i was thinkin about going to 4.10 from 3.73. hey chris, do you usually re-gear your diff your self?
     
  6. Sep 13, 2009 at 10:05 PM
    #6
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    Nope. I dont quite have the patience to do diffs. :eek: Going to 4:10's would work great with a 33" tire. If I go to 33's, thats the ratio Im going to. :)
     
  7. Sep 13, 2009 at 10:31 PM
    #7
    gupster88

    gupster88 Well-Known Member

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    wait you aren't running 33's? i could've sworn thats what it looked like you were running in your pics. so what do you have?
     
  8. Sep 13, 2009 at 10:32 PM
    #8
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    4.10 gears, sliders, and lots of buttons.
    Im running 285/60/18's. They are listed as a 32" tire, and are 31.6" tall.
     
  9. Sep 13, 2009 at 10:34 PM
    #9
    jdkeller

    jdkeller How many words can be fit in this s

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    Dome light LED, 6000k HID Headlights and fogs, Grillcraft black mesh, rear 5100's, Total Chaos UCA's, 285/75/16 BFG KM2's, Spidertrax spacers, Blacked out emblems, cb,kenwood tm270 ham radio, All Pro 3" leaf pack, Fox 2.0 coilovers, Revenge Fab Sliders, u bolt flip kit, Pioneer avh4200, bed bar with light and antenna, Wet Okoles, Weathertech Mats, Wet Okole Armrests, Rear KR Fab bumper, bed mat, N-Fab spare tire carrier with full size spare on 16" TRD rim, Bedlinered flares and grille. Camburg Spindles, All Pro front fenders.
    Would putting 4:10's in help with gas mileage?
     
  10. Sep 13, 2009 at 10:35 PM
    #10
    gupster88

    gupster88 Well-Known Member

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    hmm. thanks for correcting my mind there :D
     
  11. Sep 13, 2009 at 10:36 PM
    #11
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    4.10 gears, sliders, and lots of buttons.
    Generally, after you regear closer to OEM, mpg returns to near stock.
     
  12. Sep 13, 2009 at 10:37 PM
    #12
    jdkeller

    jdkeller How many words can be fit in this s

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    Dome light LED, 6000k HID Headlights and fogs, Grillcraft black mesh, rear 5100's, Total Chaos UCA's, 285/75/16 BFG KM2's, Spidertrax spacers, Blacked out emblems, cb,kenwood tm270 ham radio, All Pro 3" leaf pack, Fox 2.0 coilovers, Revenge Fab Sliders, u bolt flip kit, Pioneer avh4200, bed bar with light and antenna, Wet Okoles, Weathertech Mats, Wet Okole Armrests, Rear KR Fab bumper, bed mat, N-Fab spare tire carrier with full size spare on 16" TRD rim, Bedlinered flares and grille. Camburg Spindles, All Pro front fenders.
    I should do this cuz i lost like 50 miles a tank
     
  13. Sep 13, 2009 at 10:39 PM
    #13
    gupster88

    gupster88 Well-Known Member

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    x2! i lost about 30 miles to the tank, that's with calculating in the 7% tire size differential
     
  14. Sep 13, 2009 at 10:42 PM
    #14
    jdkeller

    jdkeller How many words can be fit in this s

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    I want to do the regearing but its so expensive. Definitely not a cheap mod. Especially if you cant install it yourself.
     
  15. Sep 13, 2009 at 10:44 PM
    #15
    gupster88

    gupster88 Well-Known Member

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    i have the capability to do the mod myself with my brother's girlfriend. but i need to make sure i'm going to keep my 3" lift first
     
  16. Sep 13, 2009 at 10:46 PM
    #16
    jdkeller

    jdkeller How many words can be fit in this s

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    Why wouldnt you wanna keep it?
     
  17. Sep 13, 2009 at 10:48 PM
    #17
    gupster88

    gupster88 Well-Known Member

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    not lookin forward to the maintenance im gonna have to do on the lift in the future. plus i gotta worry about my cv joint boots tearing eventually which means a really fun time replacing them.

    at first it was the crappy ride, but i quickly realized i have a spacer/block lift so it can get MUCH better with a little more money.
     
  18. Sep 13, 2009 at 10:50 PM
    #18
    MsTRD

    MsTRD hell yes i love my truck

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    yeah its definitely not gonna be cheap. my plan is to remove the differential myself (well..technically the bf will do that) and just bring that in so it shaves some labor time off for the shop. hopefully it works :thumbsup:
     
  19. Sep 13, 2009 at 10:51 PM
    #19
    gupster88

    gupster88 Well-Known Member

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    good idea
     
  20. Sep 13, 2009 at 10:52 PM
    #20
    jdkeller

    jdkeller How many words can be fit in this s

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    Dome light LED, 6000k HID Headlights and fogs, Grillcraft black mesh, rear 5100's, Total Chaos UCA's, 285/75/16 BFG KM2's, Spidertrax spacers, Blacked out emblems, cb,kenwood tm270 ham radio, All Pro 3" leaf pack, Fox 2.0 coilovers, Revenge Fab Sliders, u bolt flip kit, Pioneer avh4200, bed bar with light and antenna, Wet Okoles, Weathertech Mats, Wet Okole Armrests, Rear KR Fab bumper, bed mat, N-Fab spare tire carrier with full size spare on 16" TRD rim, Bedlinered flares and grille. Camburg Spindles, All Pro front fenders.
    Good idea! But isn't the whole axle and differential one piece? :confused:


    BTW: Now I know why you were ignoring myself and HBMurphy in the socal girl trucks thread ;)
     
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