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Old 05-02-2014, 02:58 PM   #1
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Quick gear question/rationale

I have a quick gear question and break down of what my rationale is. Let me know what you all think in regards to what gears I should run.

Jeep Info:
- '13 JKU and looking at running 315/70R17 Nitto Trail Grapplers on. As most know the Nittos are heavier.
- I don't see myself running 37s anytime soon. However, if I run the Nitto Trails in 35 or 315/70 they are a heavier tire as mentioned.
- As far as weight, I hope to get a front and rear bumper and winch sometime in the, hopefully, not too distant future. I currently have the Rubi rail and Ace sliders.
- my JKU currently has the 3:73's
- terrain around here isn't mountainous or very hilly. More mud than anything.

Rationale:
I had 4:56 in my Tahoe with 6" lift and 35s years ago along with a programmer and it seemed to do alright. Although the jeep is going to have less horsepower (don't know that that matters much). I'm thinking that I would not really be able to tell the difference between 4:56 and 4:88 as far as daily driving goes, mpg, etc., etc. So that makes me think that maybe I should just go the 4:88 route. My only hold back of just going 4:88 is due to the fact that my rig sees mostly pavement and a good mix of highway/city, maybe more highway than some. I have to drive interstate everyday for work. Not long distance though.

Are my comments on not being able to really know the difference between the 4:56 and 4:88 sound about right? OR is my normal day to day driving habits sound like I need to stick with 4:56?

Thanks.
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Old 05-02-2014, 03:23 PM   #2
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Plenty of people are running 35s with 3.73s, may not be too bad given your usage type.

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Old 05-02-2014, 09:38 PM   #3
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With your weight or future weight, I'd go with 4.88's, especially if you're running an automatic. I just went from 4.10's to 4.56's in my 2013 Rubi 6-speed 2-door with 35's and they put my RPM's right back to when the Jeep was stock. My mileage hasn't change, but the power diff is noticeable - in a good way. Prob woulda been happy with 4.88's, but my commute is 100 miles per day, so I didn't wanna risk it.
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Old 05-02-2014, 11:55 PM   #4
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3.73 with 35's is not optimal. Sure some guys tolerate it but if you have it in the budget to regear, I would strongly recommend it. If you are debating 4.56 vs. 4.88, go 4.88. Especially if you think you may want 37's in the future..

-Dan
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Old 05-03-2014, 12:43 AM   #5
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Originally Posted by Daniel_M View Post
3.73 with 35's is not optimal. Sure some guys tolerate it but if you have it in the budget to regear, I would strongly recommend it. If you are debating 4.56 vs. 4.88, go 4.88. Especially if you think you may want 37's in the future..

-Dan
This very true. My 2012 JKR is lifted 4", front and rear steel bumpers, and 35" KM2s on DC2 wheels. I was unfortunate enough to get the 3.73 gears with my Rubicon.... It still performs well off road but the freeway driving up and down the hills on I8 and SR78 really suck the life out of it.

It is still tolerable, just not optimal as you mention. I am going to re-gear with either 4.56 or 4.88 gears soon... Still trying to make my own mind up. I am leaning towards 4.88s as I do actually plan on running 37" tires eventually. (Soon after I get an White 2015 Shaker Challenger 392 to daily drive...

LOL, you only live once.

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Old 05-03-2014, 03:03 AM   #6
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Because you have a JKU (4 door), which is about 400 lbs.heavier, plus heavier Nitto 315s, then this would justify the 4.88s.........

Plus heavier bumpers and a winch in the near future, will add even more additional weight, so yes, gearing with 4.88s, will be a major plus......
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Old 05-03-2014, 10:03 AM   #7
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Originally Posted by Old Dogger View Post
Because you have a JKU (4 door), which is about 400 lbs.heavier, plus heavier Nitto 315s, then this would justify the 4.88s.........

Plus heavier bumpers and a winch in the near future, will add even more additional weight, so yes, gearing with 4.88s, will be a major plus......
This.

I have 4.56 on my 2dr and they're just fine. With the extra weight of the 4dr and the gear, 4.88 would probably be a better choice.
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Old 05-03-2014, 11:17 AM   #8
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I have a 4 door automatic that had 3.73's. I have smitybuilt bumpers front and rear and had 33's, when I just regard to 4.88 and it was perfect. BUT now I just put 35-12.50's Goodyear kevlars on and I really wished I would've got 5.13's. Jmo
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Old 05-03-2014, 11:42 AM   #9
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With weight and all...I don't think you would regret 4.88
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Old 05-03-2014, 12:08 PM   #10
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Quote:
Originally Posted by Motochain View Post
I have a 4 door automatic that had 3.73's. I have smitybuilt bumpers front and rear and had 33's, when I just regard to 4.88 and it was perfect. BUT now I just put 35-12.50's Goodyear kevlars on and I really wished I would've got 5.13's. Jmo
^^^Yep, 5.13 with the (3.8 engine), but the OP, has the (3.6 engine), so 4.88s.....
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Old 05-03-2014, 12:14 PM   #11
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Originally Posted by Old Dogger View Post
^^^Yep, 5.13 with the (3.8 engine), but the OP, has the (3.6 engine), so 4.88s.....
your right, I didn't even think about the different engines. Me=DA

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