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Old 05-05-2015, 07:05 PM
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Gear Ratio and Axle Questions

So I am fixing up my wrangler bit by bit and the next couple of upgrades I am doing will be to put in a lift (going with zone combo 4.25) and new 33" tires (not sure on exact brand -- also not sure if I will upgrade my wheels or not because I have the 15" columbia edition wheels which I really like)

Anyways, my question is around gear ratios and which axles I have, may need etc. Totally have no idea about gear ratios or axles, so hoping you guys can give me some pointers.

I have done some digging and I am fairly confident (although not 100%) I have the Dana 30 on my front and Dana 35 on my rear. I have an '04 wrangler x 4L auto if that helps.

Anyways, I was wondering do I need to upgrade my axles, re-gear the current axles or what to make the wrangler run right after I do the lift and bigger tires.

As always, thanks in advance!

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Old 05-05-2015, 07:16 PM   #2
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if you're sticking to 33's, don't worry about swapping axles.

with revolutions new 5.13 gear set for d30, you may want to go that deep. the 4.88 would be nice but i believe some have commented on wanting even deeper gears with 33" tires and the super low .69 o/d of the 42rle

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Old 05-05-2015, 09:08 PM   #3
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4.88 gears should be enough for 33" tires. You'll also want to get some hub-centric wheel spacers to keep the tires from rubbing.
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Old 05-05-2015, 09:15 PM   #4
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X2 on the 4.88 for 33" tires. But if you are likely to get 35's in the not too distant future, I'd go with 5.13 for reasons given above. That .69 Overdrive ratio of your 42RLE transmission makes the highway RPMs stupid-low so you need lower ratios like 4.88 or 5.13 to compensate for it.
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Old 05-05-2015, 09:28 PM   #5
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I have heard about the 4.56 gear ratio. What is the good and bad about using that versus the 5.13? Will the top gear be able to be used in a stick on the highway with the 5.13?
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Old 05-05-2015, 10:18 PM   #6
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I have heard about the 4.56 gear ratio. What is the good and bad about using that versus the 5.13? Will the top gear be able to be used in a stick on the highway with the 5.13?
4.56 is suggested for the manual. I have 4.56 with my 5 speed and It is amazing with my 33's.
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Old 05-05-2015, 10:28 PM
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Awesome. Thanks everyone. Sounds like 4.88 is the way to go. Any idea what I could expect to pay to have my current ratio switched to the 4.88? No clue what my current ratio is.
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Old 05-05-2015, 10:30 PM   #8
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Around here it costs about $1350.
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Old 05-05-2015, 10:34 PM
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Around here it costs about $1350.
Is that for parts only or to have it done? I wouldn't even know where to begin on a job like that.
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Old 05-05-2015, 10:45 PM   #10
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$1300-1500 to have it done. That includes all parts and labor for both axles.
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Old 05-05-2015, 11:05 PM   #11
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This might help identify what you have
http://www.jeepfan.com/tech/jeep-axles-spotters-guide/
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Old 05-06-2015, 08:25 AM
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X2 on the 4.88 for 33" tires. But if you are likely to get 35's in the not too distant future, I'd go with 5.13 for reasons given above. That .69 Overdrive ratio of your 42RLE transmission makes the highway RPMs stupid-low so you need lower ratios like 4.88 or 5.13 to compensate for it.
Would it be a bad decision to go with 5.13 if I never use bigger tires than 33s? Don't want to get to low of a ratio if that would hurt overall performance.

Not sure I will go above the 33 size because of other elements needed like bigger lift etc
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Old 05-06-2015, 08:54 AM   #13
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according to grimm jeepers gear calculator you're looking at 123 rpm difference at 70 mph

4.88 = 2400
5.13 = 2523
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Old 05-06-2015, 09:20 AM
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Originally Posted by Ironhead Jed View Post
according to grimm jeepers gear calculator you're looking at 123 rpm difference at 70 mph

4.88 = 2400
5.13 = 2523
Good info! Is that based on the 33s?
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Old 05-06-2015, 09:28 AM   #15
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yep, with the 42RLE and NP231 TC
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Old 05-06-2015, 09:45 AM
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Interesting...so perhaps my best option is to go with the 5.13 whether I end up slapping on the 35s in the future or sticking with 33s...

Also, what should I do first? The lift/tires or the re-gear?
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Old 05-06-2015, 10:01 AM   #17
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Interesting...so perhaps my best option is to go with the 5.13 whether I end up slapping on the 35s in the future or sticking with 33s...

Also, what should I do first? The lift/tires or the re-gear?
Id say lift first so you can fit the 33's under it. Then while getting regeared, do the tires. I did it in reverse. I put my tires on, regeared, then lifted. It can work with a 1 inch body lift. I wouldnt do any wheeling with 33's and 1 inch body lift.

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