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Thread: Regearing for 35's with auto transmission

  1. #1
    Join Date
    Dec 2016
    City/State
    Hixson, Tn
    LJ Year
    2006
    Year Purchased
    2016
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    10

    Regearing for 35's with auto transmission

    Hello folks,
    I just put 35's on &I know it needs regeared, I have an 06 LJ hardtop with auto trans, it's running 3:73 gears now. I've talked to a few people & my local shop & of course getting mixed opinions which I realize. Primarily being used for off-roading on the weekends, not a DDriver. But would like to cruise on the road to different off road areas & not lose that. Most are recommending 4:56 or 4:88 or some going into the 5:'s
    Any help would be greatly appreciated
    Thanks

  2. #2
    Join Date
    Aug 2012
    City/State
    Highland, IL
    LJ Year
    2006
    Year Purchased
    2012
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    166

    Re: Regearing for 35's with auto transmission

    From what I've read, you won't regret going to 5.38, but at the least 5.13. Especially with the heavier LJ/hardtop combo.

    http://www.jeepforum.com/forum/f9/re...-38-a-4115681/
    Last edited by 1 Long TJ; 08-17-2017 at 04:26 AM.

  3. #3
    Join Date
    Jun 2017
    City/State
    Wellington, Nevada
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    2006
    Posts
    5

    Re: Regearing for 35's with auto transmission

    X2, 5.13 or better 5.38's.

  4. #4
    Join Date
    Dec 2016
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    Hixson, Tn
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    Re: Regearing for 35's with auto transmission

    Any idea what the 5.13 or the 5.38 will run the rpms in OD?

  5. #5
    Join Date
    Jun 2017
    City/State
    Wellington, Nevada
    LJ Year
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    Re: Regearing for 35's with auto transmission


  6. #6
    Join Date
    Dec 2016
    City/State
    Hixson, Tn
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    Re: Regearing for 35's with auto transmission

    Any recommendations lockers?
    Since I'm already going to regear

  7. #7
    Join Date
    Jun 2017
    City/State
    Wellington, Nevada
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    2006
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    5

    Re: Regearing for 35's with auto transmission

    ARB's

  8. #8
    Join Date
    Dec 2016
    City/State
    Hixson, Tn
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    2016
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    Re: Regearing for 35's with auto transmission

    Is anybody on this forum running the same combination that I have ?,auto,hardtop,35's
    My local shop is recommending 4:56, & not to go with 4:88 or lower due to breaking the gears.

  9. #9
    Join Date
    Jun 2017
    City/State
    Wellington, Nevada
    LJ Year
    2006
    Posts
    5

    Re: Regearing for 35's with auto transmission

    Yes I am....don't listen to them get 5.38's, they are idiots.

  10. #10
    Join Date
    Dec 2016
    City/State
    Hixson, Tn
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    Re: Regearing for 35's with auto transmission

    What gearing do you have in yours 5:38's
    What kind of rpm's are you running at highway speeds,say 60 or 70?
    Thanks

  11. #11
    Join Date
    Jul 2017
    City/State
    Chester, Ma
    LJ Year
    2004
    Posts
    2

    Re: Regearing for 35's with auto transmission

    There is a lot to the questions your asking. You say you are running mostly off raod and not a daily driver. How many miles do you spend in a month on the pavement vs in the dirt. Running 35's in a 4.0 with an auto, I 've done both 410 and 456 on 35's and a 4.0. The 410 were Ok with a ARB. Not terrible at all and still did OK on rocks and mud. With the auto, there is a little give. Its a good on/off road combo and miles actually picked up from the 373 gears a bit. 456's are a good choice, especially with the auto, because you do have the OD. If your a true rock crawling machine, then you may want to go lower than that, but you have to take a serious look into how you enjoy driving it. After all, its a lot of money to spend and not be happy. If you were to go the 538's, you street performance is going to be minimal , but off road would be better. I also have had great luck with Eaton E Lockers. Love em. Running 538's on the highway, your going to have one screaming motor at 70 MPH.

  12. #12
    Join Date
    Jun 2017
    City/State
    Wellington, Nevada
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    Re: Regearing for 35's with auto transmission

    RPM with 5.13's at a true 60mph is 2040, 70mph is 2380
    ''''''''''''''''''''''5.38'''''''''''''''''''''''' ''''''''''' 2138 """""""""" 2495

    Neither is screaming, engine is running at RPM that allows it to pull small hills without having to dnshift all the time.

    Play with the gear ratio calculator.

    If you have a heavy LJ..hard top, cage, spare, bumpers winch etc...get lower gears.

  13. #13
    Join Date
    Jul 2017
    City/State
    Chester, Ma
    LJ Year
    2004
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    2

    Re: Regearing for 35's with auto transmission

    Just offering my 2 cents worth. Let us know what you choose and let us know how you like it.

  14. #14
    Join Date
    Dec 2016
    City/State
    Hixson, Tn
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    Year Purchased
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    Re: Regearing for 35's with auto transmission

    I usually drive it only once a week, it's defidently not going to be a rock crawling machine. I am just wanting to be able to drive on the road to different locations to take it Offroad trail riding & off road parks. I just don't want the eng screaming at 70 mph. That's why I was asking if anyone was running what I have: 35's, auto LJ I will be carrying a spare, will be adding different bumpers & a winch. I would like to use the overdrive when it is on the road, and not have to turn it off because I chose the wrong gearing.

  15. #15
    Join Date
    Dec 2016
    City/State
    Hixson, Tn
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    2016
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    Re: Regearing for 35's with auto transmission

    Sounds like the 5.13's may be to low for what I want & I'll have a screaming motor on the hwy with the OD on.

    I appreciate everyone helping me out.

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