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Old 06-27-2012, 05:54 AM   #1
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35" tires / 2.5" lift - are 3.73 gears enough?

Hello everyone,

I'm a 99% DD guy but do have some steep inclines to deal with - would I need to re-gear?

Thanks!

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Old 06-27-2012, 07:02 AM   #2
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Unless you own the 12 with more valves and higher reving then a honda vtec, yes you most likely will need to regear.

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Old 06-27-2012, 07:02 AM   #3
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I really don't think so based on the research I've done. I'm about to have a 3.5" lift installed and will run 35s with the factory 3:73's and auto tranny on a 2012 JKU Sport S.
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Old 06-27-2012, 08:18 AM   #4
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Quote:
Originally Posted by pkmcd99 View Post
Unless you own the 12 with more valves and higher reving then a honda vtec ...
One main, often-overlooked difference, is that, based on the auto-tranny gearing alone, 1st gear in the 2012 auto is geared 19% lower than 1st gear in the pre-12 autos; and 5th gear in the 2012 auto is 20% lower than 4th (the top) gear in the pre-12 autos.

So, my 2012 Jeep auto with 3.73s is geared almost as low as a 2011 auto with 4.56s (the actual equivalent would be 4.49s, which they obviously don't make).

Any helpful pulling power of the 3.6L (even if it's only 10% or so at low revs) adds to that 20% gearing difference. That's why the '12s autos can more-easily spin heavier tires:- engine and much (20%) lower gearing at the tranny.

The 2012 manual is the same as the 2011 manual. So the 2012 manuals only have the engine difference versus the pre-'12 manuals I think.

1st Gear:
2007-12 Manual: 4.46:1
2012 Auto: 3.59:1
2011 Auto: 2.84:1
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Old 06-27-2012, 09:18 AM   #5
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Quote:
Originally Posted by nycenglish View Post
Hello everyone,

I'm a 99% DD guy but do have some steep inclines to deal with - would I need to re-gear?

Thanks!
Depends. Are you a 2012? If so then you should be ok. I am a 2008 with th 3.8L and have 3.25" of lift and 35's on my DD, with 3.73 and auto trans. I tolerate it but everyone is different. I do, however, have 5.13's sitting in my living room waiting to be installed and I will probably be dancing once they are in.

Do you have to regear? No. You should consider it though

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Old 06-27-2012, 10:02 AM   #6
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Silly me! I totally forgot to mention I have a 2012 auto.

Quote:
Originally Posted by Daniel_M View Post
Depends. Are you a 2012? If so then you should be ok. I am a 2008 with th 3.8L and have 3.25" of lift and 35's on my DD, with 3.73 and auto trans. I tolerate it but everyone is different. I do, however, have 5.13's sitting in my living room waiting to be installed and I will probably be dancing once they are in.

Do you have to regear? No. You should consider it though

-Dan
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Old 06-27-2012, 10:17 AM   #7
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I have a '12 Sahara auto and 3.73's also a DD running 35's. It is amazing how much more useable street/hiway power this has over my previous '02 Sport 4.0 auto with 3.73's (RIP). I think you will be pleasantly surprised.
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Old 06-27-2012, 11:49 AM   #8
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Just put on a 3" lift on my 2012 JK with 3.21s. I put on 305/70/17 KM2s (vs. 35s) because I didn't want to take the chance on a re-gear. My husband and I are both lead foots- and while I noticed a small difference, it is perfectly acceptable. With 3.73s and 35s I would think you'd be fine- as others have mentioned. Just decide how important those 35s are to you. They do look better but as a DD is there a benefit? A re-gear will cost you $1000-$1500. That's a lot of money to spend on other mods.

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