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Old April 1st, 2013, 05:14 PM   #1
joe_jeep
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Default lj rubicon 44's with 5.89 gears

you can only go to 5.13 thick gears with the factory air lockers.
anyone on here swap to arb's or detroits, and go to a lower thin gear.
with my 42rle 's horrible overdrive ratio, and quirky shift points, i want a lower gear.
im considering a detroit in the rear and either lock right or an arb up front.
i want 37's, and 5.13 is not great for that. i am thinking 5.89 would be best.

5.89 is 2750 at 75 mph. just under 2600 at 70 mph.

5.13 is 2400 at 75 mph. 2250 at 70 mph

i know this sounds pickey, but i have heard 37's on a rubicon with an automatic blows.
this is a mostly street jeep, so hiway manners are a primary focus.

i can sell my stock lockers, air pumps, and gears to offset some of the cost.

i hate lugging on the freeway with too low of an rpm, and constantly shifting in and out of overdrive. i would like to use my overdrive most of the time. swapping out my 42rle for an aw4 is not an easy task wiring wise from what i hear. it is seldom done, so you know it aint easy.

anyone running low gears on their tj or lj rubicon??
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Old April 1st, 2013, 05:54 PM   #2
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I wouldn't run that low of gear on a dd. what about 5:38s
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Old April 1st, 2013, 07:23 PM   #3
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I share your 42rle pain, and am running a smaller 33" tire with 3.73s, and when I lock out the OD (which is every time I get in the Jeep) I am running 2500rpm at about 64, and about 2650-ish at 70. That matches up really close with your 5.89 scenario, and on the freeway, most rural highways, etc I am really happy with the way it runs - good comfortable power. I have played the same game with a 4.56 vs 4.88 swap for mine but always get stuck when I look at the rpms at a comfortable towing speed (60-65) with my camper.
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Old April 1st, 2013, 07:30 PM   #4
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mine tows my enclosed snowmbile trailer now, its bigger and heavier than your off road pop up. i gotta drop my speed to about 62 to 64 mph.
it was parked since october, and will not see anymore snow though.
i have relegated the towing duties to my super duty, or the wifes v8 wj limited.

i would like to see 2600 to 2800 in od at 75mph.
i can run 5.13's as is, i dont think 5.38's are worth doing new lockers for.
if i go to 5.13 i might stay with 35's , and i dont like that idea at all.

i wish an aw4 swap was easier!!

5.89 seems perfect to me.
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Old April 1st, 2013, 07:39 PM   #5
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I believe you can run jk 5:38s with the Jana kit on the factory lockers and gain the larger pinion.
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Old April 2nd, 2013, 10:17 AM   #6
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Yup, I had the same problems on mine. I had 3.73's on 31's, then 33's. That was horrible.

Went to 4.56's, it was way better but not great. Then went to 35's with the 4.56's, back to the suck. So now I'm at 4.88's and 35's, and it's ok. It does the job, but on 35's it really needs 5.13's. Since I still have a D30 I can't go any higher then 4.88's. If I were to go 37's then minimum would be 5.38's.
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Old April 2nd, 2013, 12:00 PM   #7
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Quote:
Originally Posted by Jeepaholic View Post
I believe you can run jk 5:38s with the Jana kit on the factory lockers and gain the larger pinion.
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Old April 7th, 2013, 06:48 PM   #8
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Quote:
Originally Posted by Jeepaholic View Post
I believe you can run jk 5:38s with the Jana kit on the factory lockers and gain the larger pinion.
yes you can. its a good option. it involves clearancing the inside of my diffs.
that is kinda a daunting grinding inside my axle.

i could also sell my lj 44's, and go to jk 44's.

5.89 would be about the perfect ratio though with my trans.
5.38 would work, but not be great.
i could do 5.38's in my current axles too with new carriers.

still exploring options. i am surprised nobody has gone to a lower gear yet.
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