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Old 04-16-2012, 10:16 AM   #1
Join Date: Apr 2012
Posts: 8
2012 sport s jku manual new purchase

I can't figure if I want 3.21 or 3.73 gears. I'm going to order later today so please help. Anybody with mpg on both? What about rpm on the freeway?

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Old 04-16-2012, 10:18 AM   #2
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I was all set to buy a 2d but the wife wants a 4d, so you know what I'm getting...

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Old 04-16-2012, 04:30 PM   #3
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Help me out guys
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Old 04-16-2012, 04:34 PM   #4
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Location: Heartland of Florida
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I have a 2dr. At 70 I am turning 2200rpm according to the tach. I do alot of short driving and I am averaging 17.5mpg. On the highway Right at 20mpg if I keep it at 70. I only have 900 miles on my jeep so far so I would expect it to get a little better when broken in. I personally would not order a jeep without the 3.73 and if I could have gotten the 4.10 in a sport I would have.
2012 JKS. 3.73 trac-loc, 6sp, tow pkg, hard top, bone stock.

My first Jeep and hopefully to be my boys first jeep in 13yrs!

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Old 04-17-2012, 04:41 AM   #5
Join Date: Dec 2011
Location: TX
Posts: 50
Read this thread for the best MPG info on the net:


3.73 gears, if you're going to ever tow, or if you're going to want to crawl increase tire size a little (not a lot) is going to be better. Your mileage will suffer a bit, but not much - if you read the thread, you'll see that it's more about driving habits and conditions. 3.73 from the factory is $50 difference. Changing gear ratios later is significantly more.

I have a JKU sport S manual with the 3.73 gears, and I'm usually right around 20mpg, and at highway speeds (60-70) am typically running at the bottom of the 2K rpm range. I don't drive in a hurry in my Jeep, though.

The 2dr and the 4dr both have advantages. Unless you're buying it just to offroad with, the 4dr will have benefits you'll notice quite often.
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Old 04-17-2012, 05:22 AM   #6
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Location: Wv
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I would go with the 3.73 or if you could get the 4.10 I think it would be better.
Just my 02.
95 YJ
97 TJ
03 TJ
11 JK
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Old 04-17-2012, 08:02 AM   #7
Join Date: Apr 2012
Posts: 8
I ordered it with 3.73 gears. Can't wait. Thanks for the link, really good info. Awesome forum
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Old 04-17-2012, 08:34 AM   #8
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Location: Peoria Heights,IL
Posts: 177
mine is a new 4 door sport s with 3.21 gears and 6spd, first tank I put in I got 22 mpg's (calculating manually) shifting at 2500 rpms (mix of highway and town driving) and last weekend pulled my atv about 60 miles to my buddies house, had no problem what so ever pulling (atv weighs roughly 600-700 lbs+the weight of the trailer)
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Old 04-17-2012, 09:37 AM   #9
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do NOT get the 3.21's

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