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Regear worth doing?

Discussion in 'Wrangler TJ (1996-2006)' started by JeepieNerd88, Feb 27, 2018.

  1. Feb 27, 2018 at 6:03 AM
    #1
    JeepieNerd88

    JeepieNerd88 [OP] Member

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    3in suspension lift 1in body lift Jk 6spd internals in stock housing Tj rubicon wheels
    I'm new to the forum but ive had my 06 Wrangler X for about 3 years now and i love it!! Only problem im having is the previous owner put the tj rubicon wheels on and ive got some serious power loss...i believe i have dana 30's? With 3.07 gear ratio and i have another set of wheels im wantinf to put on that are 12.5r15 tire size doenst really matter much right now as all im trying to figure out is what the largerst ratio i can have in these axels or do i get completely different axels.
     
  2. Feb 27, 2018 at 6:08 AM
    #2
    mudbug85603

    mudbug85603 Active Member

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    '98 SE Super 35 D30w/Aussie Core 4x4 arms, JKS and Metalcloak trackbars
    D30 or the D35 can go as numerically high as 5.13.

    Gear ratios will depend on transmission and tire height ie: 31", 32", 33', 35" it has nothing to do with rim size or tire width. Here is the best gear ratio calculator I know of http://www.grimmjeeper.com/gears.html
     
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  3. Feb 27, 2018 at 6:23 AM
    #3
    Prerunner1982

    Prerunner1982 Well-Known Member

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    Tire size matters a lot for this scenario. Gearing depends on the tire size you want to run and tire size determines what axles you can run.
    At some point the tire size (about 33-35") exceeds the capability of the stock axles.

    And welcome to Jeeps.net Chris.
     
    Last edited: Feb 27, 2018
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  4. Feb 27, 2018 at 7:25 AM
    #4
    JeepieNerd88

    JeepieNerd88 [OP] Member

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    I dont plan on goin any higher than 33 for now anyway. thanks for the gear ratio calc as well should come in handy here pretty soon
     
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  5. Feb 27, 2018 at 9:15 AM
    #5
    mudbug85603

    mudbug85603 Active Member

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    '98 SE Super 35 D30w/Aussie Core 4x4 arms, JKS and Metalcloak trackbars
    A piece of advice....If you're planing on doing any offroading now or in the future with the Dana 35 with 33 or 35" tires, you would be best served building a Super 35 at the time of regearing. A S35 is as strong if not a slight bit stronger than the stock TJ D44, the TJ D44 uses the exact same tubes as the D35 cut from the same stock actually. The only advantage of going with the TJ D44 is the fact that it's a no c-clip axle and can go with a higher numerical gear ratio, which won't mean anything as the D30 can only go to 5.13. The Ford 8.8 IMO isn't worth the money or time spent fabbing it to fit a TJ and, won't be any stronger than a S35 either.
     
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  6. Feb 27, 2018 at 11:54 AM
    #6
    JeepieNerd88

    JeepieNerd88 [OP] Member

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    Well im takin it into the shop later this week to have some prevenative maintenance done and far as i know right now i have dana 30. Ill know for sure once i fet it to the shop
     
  7. Feb 27, 2018 at 12:05 PM
    #7
    Prerunner1982

    Prerunner1982 Well-Known Member

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    Dana 30 is only the front axle.
     
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  8. Feb 27, 2018 at 12:05 PM
    #8
    JeepieNerd88

    JeepieNerd88 [OP] Member

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    3in suspension lift 1in body lift Jk 6spd internals in stock housing Tj rubicon wheels
    Im a little new to the whole modifying or replacing deal so i appologize if i sound a little less than knowledgeable
     
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  9. Feb 27, 2018 at 12:19 PM
    #9
    Prerunner1982

    Prerunner1982 Well-Known Member

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    No problem. We are here to help.
     
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  10. Feb 27, 2018 at 2:22 PM
    #10
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine Moderator

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    Welcome aboard!!
     
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  11. Feb 27, 2018 at 3:57 PM
    #11
    aggrex

    aggrex Well-Known Member

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    Welcome! Great advice given thus far. Regearing is expensive but may be necessary after upgrading to larger than OEM tire sizes. Your jeep with the proper gear set can regain back some performance and efficiency.
     
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  12. Feb 27, 2018 at 6:51 PM
    #12
    JKBob 25

    JKBob 25 Well-Known Member

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    Welcome to the forum @JeepieNerd88.

    Awesome thread. Just when I think I got some of this shit figured out. These guys come out and learn me more shit. :thumbsup:. Awesome info guys.
     
  13. Feb 28, 2018 at 5:03 AM
    #13
    mudbug85603

    mudbug85603 Active Member

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    '98 SE Super 35 D30w/Aussie Core 4x4 arms, JKS and Metalcloak trackbars
    This should help identify which rear end you have. An easy tell for the D35 is the rubber fill plug and the oval diff cover, D44 is a hexagon shape with a metal threaded fill plug

    6587d1291691518-dana-axle-identification-axle_id_01.gif
     
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  14. Feb 28, 2018 at 6:50 AM
    #14
    SmittyJeeper

    SmittyJeeper Well-Known Member

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    If you run a 33” tire I would recommend 3.73 gears for everyday driving or 4.11 for towing applications. I’ve done a few of these regears on jeeps and found that to be about the best. I regeared mine with 4.11 and tru trac limited slips which works out really well. Any gears bigger than 3.54 and you need to replace the carrier anyway just a heads up. I believe 4.88 is the biggest gears you can put in a Dana 30(front) and Dana 35(rear). Good luck!
     
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  15. Feb 28, 2018 at 8:29 AM
    #15
    mudbug85603

    mudbug85603 Active Member

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    As stated earlier the transmission and tire size will have an effect on what gear ratio should be installed. What ratio works for the manual isn't necessarily the optimal ratio for the auto. If you have the 32RE, 42RE, 42RLE, AW4, AX5, AX15, NV3500, NV3550 all will require a different ratio for the same size tire as the OD ratios are different in each one of these transmissions with the 32RE having no overdrive at all. Terrain also plays into what may be optimal, a person that lives in flat country like say Illinois can get away with one ratio while a person that lives in hilly or mountainous terrain will want a different ratio. Blanket statements like 4.10 is the best are not necessarily true. 5.13 is the highest numerical R&P that can be installed in the Dana 30 or the Dana 35. With original 3.07 gears any optimal ratio change to run 33" tires will require different carriers.

    OP, do your homework, don't just take forum posts as gospel. Doing a re-gear is not cheap upwards of $1500+ to get it done. That's a chunk of money to drop and find out that you made a mistake. The 4.0 is very happy turning 2500 RPM at 65 MPH and should be geared to do so with the transmission you have and the tire size of your choice. If you live in a hilly or mountainous area you may want to drop one ratio lower than the ratio that gets the motor running in it's optimal RPM range.
     
    Last edited: Feb 28, 2018
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  16. Feb 28, 2018 at 8:54 AM
    #16
    SmittyJeeper

    SmittyJeeper Well-Known Member

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    5" lift, 4.11 gears, tru-trac limited-slips, winch, bumbers... you know the rest.
    This is why I don’t like these things it turns out to be a big who knows more match... this guy mudbug is not worth listing too and I’m not trying to cause issues but his information is wrong and he doesn’t know what he’s talking about. Do some research online or talk to a shop. The other guys on here have good info. Best of luck to ya.
     
  17. Feb 28, 2018 at 8:56 AM
    #17
    mudbug85603

    mudbug85603 Active Member

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    '98 SE Super 35 D30w/Aussie Core 4x4 arms, JKS and Metalcloak trackbars
    Not starting a pissing match here.....What exactly is wrong with the info I've posted?
     
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  18. Feb 28, 2018 at 9:48 AM
    #18
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine Moderator

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    Your response is precisely one that would cause issues.

    And this is a great response. No reason we cant discuss each others views on things, rather than simply stating they are wrong. We aren't all going to agree on everything, but we ARE a community with a common interest. Lets work thru things in a less aggressive manor.
     
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  19. Feb 28, 2018 at 10:51 AM
    #19
    OFFGRID

    OFFGRID Well-Known Member

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    You no longer have to replace the carrriers to get bigger gears. They now make thick gears to take up the space of the offset of the smaller gear set.
     
  20. Feb 28, 2018 at 11:13 AM
    #20
    OFFGRID

    OFFGRID Well-Known Member

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    @mudbug85603 and @SmittyJeeper You both make very valid points. There are too many variables for this to be a one size fits all issue. I personally feel that 3.73 is a little short for 33s, but if you already have them installed I would not spend the money to go to 4.10s. When most of our older Jeeps were built they did not come with overdrive and didn't need them with a maximum federal speed limit of 55mph. Now we have speedlimits in TX of 85mph, and I heard that in some places in Montana that there are no speed limits. That being said 5th gear and overdrive does become a big part of your decision as well as what you will be doing with your jeep. Daily driver? Trail only? An even mix of both? An automatic transmission with lockout (most with overdrive) virtually has the same effect at the rear wheels as having a stick.

    To the issue. You have a newer jeep with either a 5 or 6 speed or an Auto with OD. You most likely have a DANA 35 in the back and DANA 30 in the front. You don't mention whether or not you have a 4cyl or 6cyl. You did say you have a wrangler X and I think that means you have a 4.0 6 cyl. My opinion is that with the 5/6 speed or OD automatic tranny that came in that jeep I would put 410s in with 33s. While in there I would at least install a Spartan locker in the back; an extra $250=/-. If per chance you have a 4cyl I would consider a little taller gear like 4.55. ( i don't think so based on your factory gear ratio of 3.07).

    Just my 2 cents based on my driving style and experience.
     
    Last edited: Feb 28, 2018
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