gear ratio for Rubicon - JeepForum.com

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post #1 of 35 Old 09-12-2013, 09:40 PM Thread Starter
jenniferjeep
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gear ratio for Rubicon

What is the gear ratio for a stock Rubicon? Will they be ok for a 35" tire?

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post #2 of 35 Old 09-12-2013, 10:20 PM
HappyTrails
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4.10 is stock for a Rubicon.
No, you will not like it on 35's and 4.10's (if you know better).
If you have an automatic transmission, get 5.13's for 35's.
If you have a manual transmission, get 4.56 or better yet, 4.88's for 35's.


2008 2-dr Rubicon, auto,
RK 2.5" Max Travel, Rancho 9000XL shocks, 37" Nittos, 5.38's, RR skids, Warn VR8000-S.
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post #3 of 35 Old 09-12-2013, 11:20 PM
suicideking
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Rubicons are available with 4.10 and 3.73. Most are 4.10 which is fine for 35's. I have the 3.73 and it's acceptable, but not ideal.
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post #4 of 35 Old 09-12-2013, 11:20 PM
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People do run 35s on 4.10s tho. It won't be as nice as 4.88s or 5.13s but it does work.

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post #5 of 35 Old 09-12-2013, 11:23 PM
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I had 4.10's on 32's...it was a dog, even for a Jeep!
JenniferJeep has the 3.8L engine...totally different animal than the 2012 (3.6L).

2008 2-dr Rubicon, auto,
RK 2.5" Max Travel, Rancho 9000XL shocks, 37" Nittos, 5.38's, RR skids, Warn VR8000-S.
RIPP Gen 2 Stg 2 Supercharger.
Political Correctness offends me.
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post #6 of 35 Old 09-12-2013, 11:24 PM
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Quote:
Originally Posted by suicideking View Post
Rubicons are available with 4.10 and 3.73. Most are 4.10 which is fine for 35's. I have the 3.73 and it's acceptable, but not ideal.
Suicideking is running a different engine and drivetrain than the OP.

To JenniferJeep: You will not want to run 35's with 4.10 gears on your 2010 Rubicon.

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post #7 of 35 Old 09-13-2013, 02:50 AM
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5.38s all the way.
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post #8 of 35 Old 09-13-2013, 06:42 AM
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I run HEAVY 35's on mine with 4:10's. Superchip helps but yes, it is very piggy. Subscribed.

2010 Rubicon, Auto, Stone White, 3"Synergy Coils, AEV Geo Brackets, MetalCloak TB's and CA's, 35" Grabbers, 17" AEV Pintlers , Adams 1310's, ORF, PSC, JCR, PIAA, TeraFlex,Rancho equipped...
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post #9 of 35 Old 09-13-2013, 08:24 AM
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I run 35s on my 2011 with 5.13 gears. Not bad but not best either - I have after gear remorse and wish I had gone with 5.38.

What I find amazing is the effect of tire weight. I have PitBulls on Raceline beadlocks for summer (offroad) and same size Hankoopk MTs on factory wheels for winter (on road) use. the pits are noticeably heavier than the Hankooks - VERY noticeable in off line response, freeway handling and road feedback. The unsprung weight of your suspension matters!

From 12 forward the Rubi has 3.73 or optional 4.10. BUT the pentastar is stronger at 1200 RPM and the transmission has a deeper 1st gear (both manual and automatic)

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The wagon should, of course, be as light as possible, but strength should not be sacrificed to lightness, for on any but the regularly traveled roads, the wagon will get many a hard knock...
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post #10 of 35 Old 09-13-2013, 10:43 AM
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2007 - current: 4.10's for all manuals.
2007 - 2011: 4.10's for automatics
2012 - current: 3.73's for automatics (4.10's are optional).

2010? Re-gear for 35's. 4.88's...maybe 5.13's..maybe deeper. Depends on if you have a stick or manual, if you have heavy wheels and armor, if you live near a lot of hills, ect...

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post #11 of 35 Old 09-13-2013, 05:21 PM Thread Starter
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What is an estimation of regearing cost?
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post #12 of 35 Old 09-13-2013, 05:25 PM Thread Starter
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Looking at the chart above the 4:10 is not even good for a 32" tire! The stock tires are 255/75 R17 which is about a 32" tire. Is that correct?
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post #13 of 35 Old 09-13-2013, 05:42 PM
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Quote:
Originally Posted by jenniferjeep View Post
Looking at the chart above the 4:10 is not even good for a 32" tire! The stock tires are 255/75 R17 which is about a 32" tire. Is that correct?
Yes, you are correct. 32's with 4.10's = sluggish. I had that setup in my Rubicon when it was stock. It was so bad that I was afraid to take the interstate because I could not accelerate quickly enough to merge with traffic.

A regear costs about $1000-2000 (parts and labor). Depends on where you live.

2008 2-dr Rubicon, auto,
RK 2.5" Max Travel, Rancho 9000XL shocks, 37" Nittos, 5.38's, RR skids, Warn VR8000-S.
RIPP Gen 2 Stg 2 Supercharger.
Political Correctness offends me.
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post #14 of 35 Old 09-13-2013, 06:55 PM
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I'm running 35's with the 3.73's on my rubicon. It could be better, but it is not bad and definitely tolerable.

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post #15 of 35 Old 09-13-2013, 07:04 PM
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Quote:
Originally Posted by MikeHoncho88 View Post
I'm running 35's with the 3.73's on my rubicon. It could be better, but it is not bad and definitely tolerable.
*sigh*

Again... MikeHoncho is running a different engine and drivetrain than the original poster.

2012 Rubicon (Black, Soft Top, Heated Seats, 6spd)
Rugged Ridge XHD Front Bumper and a Warn PowerPlant HP Winch
ACE Rock Sliders

More of a Tinkering Thread than a Build Thread (smcutter)

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