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Old 02-02-2009, 07:56 PM   #1
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Possibly going to pickup a JK, axle ratio question

So I'm looking into a new JK Sahara that is at my local dealership. The onle question i have is about the gears. I was looking on the website and was under the Build My Own area and saw 2 different axle ratios.

3.21 Axle Ratio & 3.73 Axle Ratio

When i click the tooltip it explains that one gives better gas milage and a lower RPM while the other improves acceleration, climbing grades, & carrying loads.

If i got the higher axle ratio will it hurt my highway RPMs that bad or is it nothing to really be worried over.

I used to have a 98 Wrangler SE that i just did some smaller things to when i was 18. At the moment i have a 93 6cyl which is a rust bucket.

hmm....now that i think of it should i wait till they have a "SUNDAY SUNDAY SUNDAY Push, Pull, Tow. at least $3000 on any trade in!!!!" deal and trade in my 93 that sits in my garage mostly due to leaks that shorts my radio? Never been too handy =(

hmmmm.....now my mind is working overtime and it hurts

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Old 02-02-2009, 11:06 PM   #2
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I have a Rubicon with 4.10s and I don't think it revs too high on the highway, but for me 70mph is probably about as fast as I'll ever go. I don't use it as a daily driver so fuel economy on the highway isn't a big factor for me, it's more about fun and how it performs off-road. I suppose also automatic vs manual might have a bearing on your choice as well. Do you plan to lift it and run bigger tires? If you do will you re-gear? I suppose your choice of 3.21 vs 3.73 depends on what you want to use it for most of the time but I would probably choose 3.73 over 3.21.

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Old 02-02-2009, 11:43 PM   #3
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With any Jeep, lower gears will help, especially when you decide to put some larger tires on it.

Go with the 3.73's.
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Old 02-03-2009, 08:14 AM   #4
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I'd get the 3.21's because if you ever think you'll lift, get better rubber, or otherwise actually use your Jeep, you'll want at least 4.10's.
IMHO with an autotrans:
4.10 okay for 32" tires but not great.
4.56 for 33" tires
4.88 or 5.13 for 35" tires.

Unless you keep the small tires and never see a hill, I can't see how anybody would be happy with 3.21 or 3.73.....
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Old 02-03-2009, 09:36 AM   #5
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Ok so I will have to go with the 3.73's to start than eventually upgrade if i end up upgrading everything else =P

There really isnt anything too hardcore around here in Rhode Island that i have found or want to attempt. The jeep will be my daily driver so going to stay away from anything too big for me. I''l keep posting as i get more info or questions =D Thanks for the info guys

Found a pic of my old 98 =D


& Hill that squirrel sig is amazing
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