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4:88 gears vs 4:1 Tcase

Discussion in 'Wrangler JK (2007-2017)' started by HardHat420, Mar 14, 2018.

  1. Apr 5, 2018 at 9:01 PM
    #21
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine Moderator

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    All the Automatic trannys coupled to the Pentastar 3.6 have that transmission.
     
  2. Apr 6, 2018 at 12:58 PM
    #22
    HardHat420

    HardHat420 [OP] Well-Known Member

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    Sweet thanks.

    This sux my crawl ratio is only 47:1 even with 4:88s.

    I was hoping for a 75:1 crawl ratio but for that I would need a 4:1 t case and 5:13 gears.
     
  3. Apr 6, 2018 at 1:47 PM
    #23
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine Moderator

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    Yeah, the T-case on the Sports & Sahara models dont get you the same crawl ratio as the one in the Rubicon
     
  4. Apr 6, 2018 at 1:57 PM
    #24
    Prerunner1982

    Prerunner1982 Well-Known Member

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    Are you unhappy with the way that it crawls?
    Generally around 50-60:1 is considered optimum. The torque converter will also add a little to your crawl ratio.
    If you were running a 4 cylinder with larger tires and wanted to crawl you would need a lower overall crawl ratio but with a decent 6 cylinder I would imagine 50-60 would be good. Tires also has an effect on it but for some reason isn't included in the calculation.

    My crawl ratio is only 36.98:1... :facepalm:of course I am only running 31-33" tires.
     
  5. Apr 6, 2018 at 4:50 PM
    #25
    HardHat420

    HardHat420 [OP] Well-Known Member

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    Just wish I had more torque in the lower end.

    I would need 5:13 gears for a 50:1 which is overkill for my 35s. I would do the 513s if i had a Rubicon cuz for me the crawl ratio would make up for the poor highway driving.

    I might just do 4:88. So frustrated I didn't buy a Rubicon instead. Just didn't think I'd get this much into wheeling it.
     
    Billy1234 and JKBob 25 like this.
  6. Apr 9, 2018 at 11:18 AM
    #26
    OFFGRID

    OFFGRID Well-Known Member

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    I bet you can find a Rubi Tcase for around $1500. It would be a direct bolt in. I have heard that the mounting flanges might need to be changed (not sure on this). If so you could possibly find used rubi drive shafts or maybe swap over your flanges to the Rubi Tcase. I have not personally done this swap nor known anyone who has done it, only what I've read. You would get a decent crawl while still maintaining good highway.
     
  7. Apr 9, 2018 at 11:50 AM
    #27
    Rc Jeep

    Rc Jeep Well-Known Member

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    Rubi t case was main selling point for me.

    Still crawl just fine in 4:10 and 37s. Highway is different story.
     
    chris4x4 likes this.
  8. Apr 9, 2018 at 11:59 AM
    #28
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine Moderator

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    Same here. And the lockers and sliders.
     
  9. Apr 9, 2018 at 12:00 PM
    #29
    Rc Jeep

    Rc Jeep Well-Known Member

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    Sliders will get swapped for better protection. The lockers do fail. Most of the time just a magnet that needs cleaning I figured they would get swapped at some point as well.
     
  10. May 30, 2018 at 11:38 AM
    #30
    Billy1234

    Billy1234 Well-Known Member

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    This is a old thread but I need a little info on how the hell to regear. Well more of what’s involved. Is it just taking out the old gears and putting in new ones. (I’m looking to regear this summer) like @HardHat420 i do a lot of mudding and don’t want lockers right now would like to regear instead. Any info would be greatly appreciated:jeepwave:
     
  11. May 30, 2018 at 11:42 AM
    #31
    Rc Jeep

    Rc Jeep Well-Known Member

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    Regear is usually something an axle shop takes care of. I only know one guy that does his own work on gears. Generally $1200-$2000 to regear.
     
  12. May 30, 2018 at 11:44 AM
    #32
    Billy1234

    Billy1234 Well-Known Member

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    I have a couple people I know that have race cars n what not. But the wife’s uncle has a 2014 sport with 4:88 gears he did by hisself but he lives in Long Island so a shop might be best maybe unles I can get a friend to do it. Or would lockers be a better idea? Wanna do whatever is less costly to me at the moment
     
  13. May 30, 2018 at 12:14 PM
    #33
    aggrex

    aggrex Well-Known Member

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    Just an fyi: generally the time and expense to upgrade gearing is also the best time for lockers. Separating the two tasks will result in separate labor expenses. Start saving now......
     
  14. May 30, 2018 at 12:15 PM
    #34
    Billy1234

    Billy1234 Well-Known Member

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    Didn’t even think of that thanks aggrex
     
  15. May 30, 2018 at 1:07 PM
    #35
    OFFGRID

    OFFGRID Well-Known Member

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    Agreed. I do my own gearing, and spent a lot of time reading and researching till I felt comfortable enough to attempt. The tools to do the job correctly cost me $2000+/-, but I am a lot anal when it comes to doing things correctly. My friends have since showed me that no-one does it like me and they say it is a waste of time. I will also say that all of the pros who post videos on Youtube do it like my friends. That being said the labor here in Houston is anywhere between $400-700 an axle. Aggrex is correct about if you are going to regear it is also the time to install lockers so as to not pay the labor twice.
     
  16. Jun 20, 2018 at 5:00 PM
    #36
    HardHat420

    HardHat420 [OP] Well-Known Member

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    A little late but as mentioned already regearing should be done with lockers. No sense in opening the diff twice.

    As far as cost difference, any selectable locker will run about $1k. Plus labor.

    Gears are less expensive. They're also easy to find from people selling them cheap because they decided to go a different route. I recently saw g2 488s for $160. Labor is the same as with lockers.
     
    aggrex and OFFGRID like this.
  17. Jul 12, 2018 at 7:46 PM
    #37
    jeepavalanche

    jeepavalanche Well-Known Member

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    I still haven't stopped laughing at that caption. The jeep sitting there with that wide stance you can almost see it saying that.
     

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