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Thread: 4.88s with 40s and 4:1 tcase

  1. #11
    Old Timer fiend's Avatar
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    Quote Originally Posted by Braxtonsag View Post
    Do you think my jeep only weighing 4500 lbs would have anything to do with me being perfectly fine with 4.88s and 38s?
    I think itís because you live in a flat place.


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  2. #12
    Nothing but a Thing Angry Aussie's Avatar
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    I ran 5:13s on 37s and didnít have any issues or feel like it was over geared at all. Iím currently running 40s on the same 5:13s and they work great with the 40s. I still chirp the tires every once in awhile when I have to pull out faster then normal. And I am still on my stock Dana 44s. I donít wheel that often or that hard when I do. I think you would be happier with 5:13s on 40s. Just my two cents.


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  3. #13
    Old Timer fiend's Avatar
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    Quote Originally Posted by Angry Aussie View Post
    I still chirp the tires every once in awhile when I have to pull out faster then normal.

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  4. #14
    Nothing but a Thing jdofmemi's Avatar
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    It's all good until "chirp" turns into "grind"😭

  5. #15
    Addict Ddays's Avatar
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    Quote Originally Posted by Braxtonsag View Post
    Do you think my jeep only weighing 4500 lbs would have anything to do with me being perfectly fine with 4.88s and 38s?

    More than likely yes, But the 40's would be unsprung weight that has nothing to do with the overall weight of the vehicle. That additional rotational mass is what will make it a slug IMHO.
    Last edited by Ddays; 12-07-2019 at 01:50 PM.
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  6. #16
    Administrator wayoflife's Avatar
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    I would be one of those people who would say that 5.38 is the right ratio to be running with 40's but I'd also be one to say that it's a terrible ratio to run on a Dana 44, especially if you're dead set on running 40's. The pinion on it is simply way too small. 5.13 is as high as I would go but being that you already have 4.88's and seem convinced it'll be fine, I'd just go with it.

  7. #17
    Addict Brute's Avatar
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    Quote Originally Posted by Ddays View Post
    There's a reason no one runs 4:88's on 40's. Your Jeep will accelerate like a slug.
    My JK6 has 39ís and 4.88...it accelerates pretty good...almost good enough for a burn out...

  8. #18
    Nothing but a Thing Angry Aussie's Avatar
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    Quote Originally Posted by jdofmemi View Post
    It's all good until "chirp" turns into "grind"
    So true man! Itís rare since I drive like a grandpa but it has happened a few times and Iím always relieved is a chirp and not a grind. Itís only a matter of time till it turns into a grinding noise.


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  9. #19
    Nothing but a Thing Angry Aussie's Avatar
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    Quote Originally Posted by fiend View Post



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    Better safe then sorry right! Lol being childless is nice! Lol


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  10. #20
    Meme King WJCO's Avatar
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    Quote Originally Posted by Brute View Post
    My JK6 has 39ís and 4.88...it accelerates pretty good...almost good enough for a burn out...
    Stock engine right?
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