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Thread: jeep TJ gearing question

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    Default jeep TJ gearing question



    Hey all - got a friend with a TJ Rubicon. Its has been his DD, so it is set-up with a mild OME lift and something in the ballpark of 32-33's (p-metic version). He recently pick-up a full size truck for his DD and work, and was thinking of building the TJ up a bit more and could always tow it to farther away places such as Moab. For those of you with a TJ, what gearing seems to work well with 35s? I believe his current OEM TJ Rubi (I6 4.0 of course) came with 4.10s and a 4:1 TC. Maybe a long arm lift to clear the 35s and allow for good flex, and drop the gearing to something like 4.56?
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    Default Re: jeep TJ gearing question



    Auto or manual?

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    Default Re: jeep TJ gearing question



    Its definitely a manual - I believe its the 5 speed (which actually has a lower 1st than the 6speed manual?). Here is a pic of it currently:
          
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    Default Re: jeep TJ gearing question



    4.56 would be good but I'd consider 4.88 if it is going to be mostly a trail rig.

  5. The Following Member Says Thanks to newracer For This Post:

    FINOCJ (June 7th, 2019)

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    Default Re: jeep TJ gearing question



    https://www.quadratec.com/jeep_knowl...article-43.htm

    The six speed is, IMO, the best manual Jeep ever used. It's made by Mercedes Benz in Brazil and is used in a lot of light trucks and IIRC the crossfire and some other cars. The first 4 gears are underdrive, 5th is 1 to 1, and 6th is overdrive. Having said that, it doesn't really matter which one he has, all the TJ manuals are great and a lot of stock Rubicons run 35s. I'd go up in tire size first and try it if I was him, and if I did change, I think 4:10 to 4:56 is going to be a bit underwhelming, I'd go 4:88 or 5:13.

    That's a really nice TJR.

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    Default Re: jeep TJ gearing question



    I'm 4:56 on 35's good daily driver manners, too. 4" SL, 2" BL. 5 sp. manual. I'm not sure there's that much difference between 4:56 and 4:88. If I were to change anything, I'd add a crawler. But with my hand throttle, I can pretty much ease over anything...

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    Default Re: jeep TJ gearing question



    4.88 for the real good deep gearing!
    ___________
    Crazy- You call me crazy, but you wouldn't know crazy if Charles Manson was eating Fruit Loops on your front porch. Suiciadl tendancies- intatutionalized

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    Default Re: jeep TJ gearing question



    4.88 is what I had in mine, i6, manual (but the 5-speed), and 35s. he could definitely get away with 4.56 since he has the 4:1 tcase. I didn't and the 4.88s were perfect off road. on the road they were good, but I couldn't push higher than 70 very well. so if he still wants to drive it to Moab and back, maybe 4.56 is best. if he's trailering all the time and just cruising around town, then 4.88s or 5.13.

    J.

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    Default Re: jeep TJ gearing question



    I've got 35's/auto/4.88's. I like the way it works.

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    Default Re: jeep TJ gearing question



    FWIW, with the 5sp, 4:56, 35's, at 70 mph, it runs 2500 rpm's.

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    Default Re: jeep TJ gearing question



    Thanks for the feedback....I would guess going through the trouble of a regear starting from 4.10s, it would be worth going all the way to 4.88s or similar.
    ___________
    James Orofino
    1970 CJ5
    1958 Willys Wagon

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