What gears are the best
10-24-2011, 06:13 PM
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What gears are the best
I am about to put 35's on my jk an was wondering what would be the best gears for an everyday driver an able to handle the 35's ( my jk is a manual 
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10-24-2011, 06:32 PM
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I like them on highway runs... I just did Yukon 4.88s with my 35 nittos automatic and am very happy with overall performance... If I were using it more off road related may have went 5:13s.... But everyone will have there own option.
10-24-2011, 07:22 PM
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10-24-2011, 07:51 PM
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There are some faq's at the top of this modified area, check the drivetrain section for a great rpm chart. (use actual measured tire heights, not mfg's spec).
This is a few years old, but there is some good info here, including dyno charts.
https://www.jk-forum.com/forums/show...ire-Size-Chart
This is a few years old, but there is some good info here, including dyno charts.
https://www.jk-forum.com/forums/show...ire-Size-Chart
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10-24-2011, 07:57 PM
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I am confused by all these numbers
What's the difference in the low numbers versus high numbers? I just got a new 2011 Sahara Unlimited that came with 3.73 gears. I was planning on getting a Teraflex 3" lift with 35's but I think I will wait on the lift and just get some wider 18 or 20" rims and BFG A/T 33's for now. I don't plan on offroading this thing and will strictly be on the street and freeways. So what's the difference in me having the stock 3.73 gears as opposed to putting on something with a higher number?
Thanks.....JD
Thanks.....JD
10-24-2011, 08:10 PM
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What's the difference in the low numbers versus high numbers? I just got a new 2011 Sahara Unlimited that came with 3.73 gears. I was planning on getting a Teraflex 3" lift with 35's but I think I will wait on the lift and just get some wider 18 or 20" rims and BFG A/T 33's for now. I don't plan on offroading this thing and will strictly be on the street and freeways. So what's the difference in me having the stock 3.73 gears as opposed to putting on something with a higher number?
Thanks.....JD
Thanks.....JD
As an example:
A 6spd with 3.21's and 29" tires will run appx 2188 rpm @ 70mpg
Go up to a 33" tire, and you are at 1923 rpm @ 70. (pretty big performance loss).
Swap your gears to 3.73 with those same 33" tires and your rpm's come up to 2234 @ 70, or a bit better than your stock performance.
An auto with 3.73's and 32" tires = 1892 rpm @ 70.
(many auto owners will complain that this 'stock' setup is underpowered straight from the factory).
3.73 with 35's = 1730 rpm @ 70
5.13 with 35's = 2380rpm @ 70
(many auto owners will tell you that this rpm range is what their JK's should have come with from the factory).
Again, use actual measured tire heights with those charts, not mfg's numbers.
Last edited by nthinuf; 10-24-2011 at 08:13 PM.
