Thread: 4.10 vs. 4.11

  1. #1
    Join Date
    Dec 2014
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    Lone Pine, CA
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    2

    Default 4.10 vs. 4.11

    Getting ready to buy the gears for the rear of my f250. Doing a D60 solid axle swap and the front has 4.10s, I understand the reasoning of running 4.11s in the rear. I was just wondering what the consensus was on here on running a slightly lower geared rear verses the same ratio front and back.

    Richard

  2. #2
    Join Date
    Jun 2015
    Location
    Colorado, USA
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    384
    Personally; I can't tell the difference when I get, or build, a vehicle with 4.10 front and 4.11 rear as opposed to 4.11/4.11... Its plenty close enough that its not significant. on street (snow) or trail, IMO.
    ... even a 4.27/4.30 split is acceptable, IMO...
    Enjoy!
    Moderate trail off road vehicle; 2006 TJ Rubicon, 4.10s, 4:1 low range, OEM lockers, 31" (garbage) ATs...
    For DD & "civilized" camping; 2003 Ford Explorer Sport, 4wd, 4.10s, ARB rear, Torsen front, 32" MTs...
    Ground tents work best for me so far...
    Experience along with properly set up 4WD will get you to & through places (on existing, approved 4WD trails) that 4WD, alone, can't get to.

  3. #3
    Join Date
    Apr 2009
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    New England
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    Your tires could have more variance than a .01 ratio difference and that's just with inflation let alone manufacturing tolerances. The only time that would cause any problem is on dry hard pavement or concrete and in that case if you need four wheel drive you probably shouldn't be there. Just my 2 cents worth.
    "Live within your means.

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    06 Wrangler Unlimited Rubicon

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  4. #4
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    No problem at all.

  5. #5
    Join Date
    Jun 2011
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    Ohio
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    1,216
    Should be no problem. Jeep YJ's were like that all the time. That .01 is small enough for the tire tread to absorb, or wiggle out.

    I've driven 4.30, 4.56 combos before. Was a slick use only mudder, snow wheeler setup. Offroaded like a buggy in 2wd all the time. Better 4wd on power steering and stability in slop. But hit dry dirt and your xfer case explodes. LOL.
    2017 Ford F250
    '02 Honda CRF450r,
    '04 Ford Mach1
    '12 Suzuki DRZ400S
    '12 Ducati Panigale 1199S

  6. #6
    Join Date
    Mar 2009
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    3,196
    They do that because that's all that is available for the diffs not by design. In other words you have no choice.
    Arizona

  7. #7
    Join Date
    Dec 2014
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    Lone Pine, CA
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    Quote Originally Posted by Stumpalump View Post
    They do that because that's all that is available for the diffs not by design. In other words you have no choice.
    I brought this up since the stock gear ratio in the D60 I'm putting in the front of my F-250 are 4.10s. When I looked at summit racing to buy gears to re-gear the Sterling 10.25 I have in the back of my truck they list both 4.10 and 4.11. so apparently I do have a choice.


    Richard

  8. #8
    Join Date
    Jul 2012
    Location
    Whistler, BC
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    245
    4.10 will have 41/10 teeth so more, but smaller for the same diameter ring. 4.11 will have 37/9 teeth which will be larger. The 4.11 is a stronger pinion.
    2016 F350 CCLB FX4. 7" One up Offroad-Icon-Fox suspension. 38x13.5-18 Toyo MT.

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