Author Topic: Gear ratio  (Read 1876 times)

WarEagle72690

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Gear ratio
« on: January 18, 2018, 09:06:54 AM »
So I'm starting to look for new tires. My question is, with my stock 4:10 gears could I run 35" tires or should I stick with 33"s? Any input is greatly appreciated.

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Russ

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Re: Gear ratio
« Reply #1 on: January 18, 2018, 10:12:26 AM »
Here is a useful chart for that.  You are good with 4.10.  That is about the top end for them.  I think there are some running larger on 4.10s though.

WarEagle72690

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Re: Gear ratio
« Reply #2 on: January 18, 2018, 06:26:39 PM »
Is this based off of a JK? 

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Russ

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Re: Gear ratio
« Reply #3 on: January 19, 2018, 09:57:47 AM »
I think it is.  The 3.6L Pentastar only dates back to 2012 Wranglers I think.

austin160

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Re: Gear ratio
« Reply #4 on: January 22, 2018, 07:00:25 AM »
4.10 and 35’s would be fine.  If you plan on doing some harder crawling a lower gear will be better.  Just for occasional trails, DD, and road comfort, 4.10s will do the trick.


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Clint

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Re: Gear ratio
« Reply #5 on: January 22, 2018, 10:54:01 AM »
I just realized you are in TJ. Did you ask this over on the FB page? There was some good information there a few days back about the automatic transmission and trying to run anything bigger than a 33.

s2inga

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Re: Gear ratio
« Reply #6 on: January 23, 2018, 07:14:11 AM »
I just realized you are in TJ. Did you ask this over on the FB page? There was some good information there a few days back about the automatic transmission and trying to run anything bigger than a 33.

IMO,,,Auto trans and the 4.10 gears in the TJ max out at a 33” tire. 
2012 JKU Sahara & 2004 TJ Rubicon

markhuntsville

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Re: Gear ratio
« Reply #7 on: January 23, 2018, 11:17:03 AM »
I just realized you are in TJ. Did you ask this over on the FB page? There was some good information there a few days back about the automatic transmission and trying to run anything bigger than a 33.

IMO,,,Auto trans and the 4.10 gears in the TJ max out at a 33” tire.

I've got a friend with LJ Rubi, auto, stock 4.10s, and running 35s with no real driveability issues..
BUT, with my '06 LJ auto (non-Rubi), I'm running 4.88s and 35s - the overdrive is terrible, it shifts into OD WAY too soon.
I think the Rubi computer has different shift points than my non-Rubi, which makes it tolerable.
2006 LJ, Auto, 241OR with 2LO, 35" MT/Rs (soon 37s)
Front/Rear Rubi 44s fully armored by Artec
488s, ARBs, RCV front and Chromoly rear shafts
Long arms, Warn 9.5CTi w/synthetic rope and Factor 55 ProLink

WarEagle72690

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Re: Gear ratio
« Reply #8 on: January 23, 2018, 11:39:05 AM »
Yeah I posted it to fb as well. I found a AW4  for like $30 but it needs to be rebuilt, not sure how much it would cost to have it rebuilt and swapped for my TJ.

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markhuntsville

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Re: Gear ratio
« Reply #9 on: January 23, 2018, 01:04:52 PM »
Yeah I posted it to fb as well. I found a AW4  for like $30 but it needs to be rebuilt, not sure how much it would cost to have it rebuilt and swapped for my TJ.

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Swapping to an AW4 in your TJ Rubicon (from the 42RLE) would be extensive... not impossible, just a lot of work.

I swapped from an AX15 to AW4 in my '97 TJ and it wasn't terrible since the AW4 stand-alone computer just needed a few signals from the TJ computer.

2006 LJ, Auto, 241OR with 2LO, 35" MT/Rs (soon 37s)
Front/Rear Rubi 44s fully armored by Artec
488s, ARBs, RCV front and Chromoly rear shafts
Long arms, Warn 9.5CTi w/synthetic rope and Factor 55 ProLink

Blake P.

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Re: Gear ratio
« Reply #10 on: March 14, 2018, 11:04:26 AM »
I'm running 4.10s on a 4 Cylinder with a 33" tire so I'd think the 4.0L could handle it
Yellow 06' TJ
Metal Cloak Fenders
Body Armor Roof Rack
33' M/T
Zone Off-Road 3' lift (soon)
Line-X Interior

AOR

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Re: Gear ratio
« Reply #11 on: December 28, 2018, 03:46:08 PM »
http://www.grimmjeeper.com/gears.html

^^Here is the ultimate gear ratio calculator.  If you have an auto in your '05, I would do 4.88s with 35s if you don't have a lot of hills to climb or a bunch of headwinds to fight all the time.  The overdrive is ridiculous in the '04+ TJ/LJ platform.  I had a 2006 LJ Rubicon with 37s and the 4.88s were a total bummer in the foothills where I live.

Sorry for resurrecting old thread.

Allen

Tedford

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Re: Gear ratio
« Reply #12 on: January 21, 2019, 06:01:49 AM »
Glad you bumped this thread up, Allen. That's a fantastic tool you linked there. I've been looking for something like that for the past couple of weeks.

AOR

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Re: Gear ratio
« Reply #13 on: January 21, 2019, 03:56:17 PM »
Glad to be of help.  I would be more active if I could post on Facebook.  I got approval, but, still no joy.  Have to address that I guess.

Have a great Day.

Allen