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Transmission swap

Discussion in 'Wrangler TJ (1996-2006)' started by LJ4LJ, Sep 16, 2022.

  1. Sep 16, 2022 at 9:51 AM
    #1
    LJ4LJ

    LJ4LJ [OP] Member

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    I have an ‘06 LJ 4.0 I want to put a manual tranny in it. I know it had a NSG370 option. But I have an AX5 will it fit?
     
  2. Sep 17, 2022 at 7:46 AM
    #2
    Dirty Dog

    Dirty Dog Member

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    Not directly, no. You can generally find an adapter to mate any transmission to any engine. But should you? The AX5 is a small car transmission. Sticking it in a Jeep was a bad idea from the start, and even with the 2.5L it is notoriously fragile. Putting it behind a 4.0L is begging for trouble.
     
    aggrex likes this.
  3. Sep 17, 2022 at 8:07 AM
    #3
    LJ4LJ

    LJ4LJ [OP] Member

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    Ok I found a NSG370
     
  4. Sep 17, 2022 at 9:01 AM
    #4
    MTgeezer

    MTgeezer Well-Known Member

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    Obviously the least expensive, easiest option. The No Significant Gear 370 doesn't work all that well off road with the 3.6 and the 4.10 gears but should work a lot better with the 4.0. I'm not sure about the TJ application, but in a JK they don't like staying in gear over anything really rough. B&M makes a cure-for another $600.
     
  5. Sep 17, 2022 at 9:06 AM
    #5
    LJ4LJ

    LJ4LJ [OP] Member

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    You are talking about the B&M short throw? Thanks!!
     
  6. Sep 18, 2022 at 8:19 AM
    #6
    Dirty Dog

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    I have heard that this is an issue, but fortunately have not personally experienced it. If memory serves, some people have found swapping fluids solves the issue without the B&M shifter.
    I've got a B&M short-throw in my Vette, and if the Jeep shifter performs as well, it's certainly a worthwhile investment, if the fluid swap fails to fix the problem.
     
  7. Sep 18, 2022 at 8:45 AM
    #7
    LJ4LJ

    LJ4LJ [OP] Member

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    Any recommendations for a manual transmission??
     
  8. Sep 18, 2022 at 12:10 PM
    #8
    MTgeezer

    MTgeezer Well-Known Member

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    IMO, unless you maybe filled the transmission with heavy grease (wouldn't end well), a change of fluids will not solve the problem. When you get a JK into something like bad washboard or just rough trail, the shifter will be violently oscillating back and forth, enough to pop it out of whatever gear you are in-it isn't particular. If you inadvertently get you hand in the way of that, it hurts. When I am anticipating a situation where that may occur, I hold on to the shifter. Pain in the ass fiat engineering. And no doubt why the JL/JT's use a completely different shifter design. I think a lot of that oscillation can be tagged to the overly flexible JK engine mounts. Whether it is a problem in the TJ's I don't know. All that said, I still think the NSG 370 is your best option.
     
  9. Sep 18, 2022 at 12:13 PM
    #9
    LJ4LJ

    LJ4LJ [OP] Member

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    Thank you for everyone’s input !!
     
  10. Sep 18, 2022 at 2:53 PM
    #10
    Dirty Dog

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    The NSG370 should work just fine. Just be sure it's got proper clearance around the shifter, since that seems to be at least part of the popping problem.
     
  11. Sep 18, 2022 at 2:55 PM
    #11
    LJ4LJ

    LJ4LJ [OP] Member

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    I’m thinking about making a custom shaft to eliminate or help eliminate positioning problems
     
  12. Sep 18, 2022 at 5:41 PM
    #12
    Dirty Dog

    Dirty Dog Member

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    Wouldn't it be easier to just enlarge the hole in the transmission tunnel?
     
  13. Sep 18, 2022 at 5:48 PM
    #13
    LJ4LJ

    LJ4LJ [OP] Member

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    Ha! Probably but I wanted to get the shifter further away from the dash and closer to the driver
     
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  14. Sep 18, 2022 at 5:59 PM
    #14
    Dirty Dog

    Dirty Dog Member

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    Could just just bend the stick? That would be custom!
     
  15. Sep 18, 2022 at 6:02 PM
    #15
    LJ4LJ

    LJ4LJ [OP] Member

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    Absolutely! And I’m lucky to have a CNC at work where the guys like to “test” new programs
     
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