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Thread: 4.56 or 4.88 for 37s on JL rubi ?

  1. #11
    Nothing but a Thing jeffj's Avatar
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    I would go 4:88 for the extra strength on the ring and pinion. If itís the same situation as the jk. I went with that on my 2012 and it was a solid set up.


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  2. #12
    Addict BaddestCross's Avatar
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    Quote Originally Posted by jeffj View Post
    I would go 4:88 for the extra strength on the ring and pinion. If itís the same situation as the jk. I went with that on my 2012 and it was a solid set up.


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    It's not a problem until you go to 5.38

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  3. #13
    Knows a Thing or Two Seahawkfan's Avatar
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    Quote Originally Posted by OverlanderJK View Post
    3000 at 70.


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    Would there be a difference in a Auto to Manual ? I run 5.13 @ 75 mph about 2400 or 2500rpm's with the new 37's. on 35's I was around 2900 or 3000 at 75mph

  4. #14
    Old Timer DWiggles's Avatar
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    I have a manual trans and 5.13s on 37s (its a JK) and couldnt be happier. SO glad I listened to these guys and went with the 5.13s over the 4.88s everyone ELSE said I should run...


  5. #15
    Knows a Thing or Two Seahawkfan's Avatar
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    Quote Originally Posted by DWiggles View Post
    I have a manual trans and 5.13s on 37s (its a JK) and couldnt be happier. SO glad I listened to these guys and went with the 5.13s over the 4.88s everyone ELSE said I should run...

    What RPM's are you running at 75 mph? Just curious.

  6. #16
    Been Around the Block Ruvicon's Avatar
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    I have an automatic, so not sure if overdrive ratios make this a good comparison, but running 4.10s with 35s and a 3.8l, it always felt under powered. I recently regeared to 5.13s and it woke up the engine. I was very pleased with the 5.13s. Now that Iím running 38s, Iím glad I didnít go with 4.88s. Iíd recommend 5.13s.


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  7. #17
    Old Timer fiend's Avatar
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    OP- the guys responding to this thread are in JKs and youíre a asking about a JL. Unless the transmissions are the same, this may be apples to oranges.


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  8. #18
    Administrator wayoflife's Avatar
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    Quote Originally Posted by Jmw015 View Post
    Ok so Iíve done what everyone else on the planet with a JL has. Iíve thrown a set of 37ís on with a couple inches of lift. It worked out great with minor reshaping of the rear inner fender liners.
    Iíve heard all this talk about the auto transmission being so great that there is no need to regear a rubicon. When I made the decision to jump on the JL bandwagon I also made the decision to get one with a man pedal. I have to say, the six speed is sweet but freaking sucks with 37s and stock gears. Off road is ok, but Iíd like to use 6th gear from time to time on the road!
    Definitely going to do a gear swap soon. My concern is with the 4.88 ratio, would I basically be eliminating 1st gear on road? Would highway speeds produce too high rpm? Is there a big difference between 4.56 and 4.88?
    My Jeep is not much heavier than stock other than the tires. I do have factory steel bumpers. AEV pintlers. Will add a winch soon and better sliders.
    Any input would be greatly appreciated! Here are a few most recent pics
    Unfortunately, the 6-speeds is nowhere near as nice as the 8-speed auto and yes, I would recommend a regear. As far as what ratio to go with goes, there is NOTHING wrong with 5.13's in an Advantek 44 and as mentioned, the problem would be when you get up to 5.38 as your pinion would be too small at that point. That being said, if MPG is an issue for you, you WILL be running on the high side of RPM's at highway speeds with 5.13's and you WILL burn more gas. If MPG is not a concern, it will give you more power off the line and crawl better too.

  9. #19
    Fresh Catch Jmw015's Avatar
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    Thanks for the input everyone! As I expected, mixed reviews. Crawling is great even with the 4.10ís. Mpg is probably slightly more important to me than most Jeep owners. 4.88 May be the route I go when the time comes. Thanks again!

  10. #20
    Administrator wayoflife's Avatar
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    Quote Originally Posted by Jmw015 View Post
    Thanks for the input everyone! As I expected, mixed reviews. Crawling is great even with the 4.10ís. Mpg is probably slightly more important to me than most Jeep owners. 4.88 May be the route I go when the time comes. Thanks again!
    If you spend a lot of time on the highway doing speeds of 70-75 mph and mpg is a concern, 4.88 is definitely what I would recommend. With 5.13's, you'll be pushing about 400 rpm more across the board and you will see a fuel economy penalty from it.

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