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Old 02-05-2014, 05:21 PM   #1
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New gears?

I have a 2003 inline 6 tj and well I was wondering what would be a good gear ratio for better mpg and acceleration

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Old 02-05-2014, 05:48 PM   #2
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Tell us what transmission and tire size you have and we can answer your question. Do you know your present axle ratio?

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Old 02-05-2014, 06:32 PM   #3
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better mpg and acceleration




Those words are rarely, if ever, used in the same sentence.
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Old 02-05-2014, 06:42 PM   #4
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Those words are rarely, if ever, used in the same sentence.
That combination of words can actually be true when there is a bad mismatch of tire size and axle ratio.
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Old 02-05-2014, 06:44 PM   #5
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I did 4.56 gears on my 4.0 5sp & I love them.Should have done it sooner
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Old 02-05-2014, 09:48 PM   #6
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Based on Jerry's and a couple of others recommendations, I went from 3.73 in my 4.0 auto 2006 LJ, running 33's, to 4.88. What a difference! I love it
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Old 02-06-2014, 08:33 AM   #7
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That combination of words can actually be true when there is a bad mismatch of tire size and axle ratio.

Hence the word rarely. Unless one is currently driving with a ridiculously off gear/tire combo ... improvement in mpg and acceleration ain't gonna happen.
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Old 02-06-2014, 08:37 AM   #8
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Improve acceleration and mpg? How so?
An extreme example would be someone with 3.07 gears and 35" tires going to 5.13 gearing on the same tires.

Better mpg, better acceleration.

Less extreme examples would be 3.73 gearing and 35" tires moving to 5.13, 4.10 gearing and 35" tires moving to 4.88, etc.

EDIT: Never mind, I see you changed your question completely.
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Old 02-06-2014, 08:42 AM   #9
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An extreme example ... 3.07 gears and 35" tires going to 5.13 gearing on the same tires.

Yeah, I edited because I knew that someone would post a ridiculous combo and post "this is how". Looking at the OP's avatar, I don't think that's the case.
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Old 02-06-2014, 08:50 AM   #10
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Yeah, I edited because I knew that someone would post a ridiculous combo and post "this is how". Looking at the OP's avatar, I don't think that's the case.

You can tell by someone's avatar? Dang! It's all good dude, I'm setting my rig up right and that's all that matters around my house.

However, if you look at the 5 or so posts about gearing or axles that have been started in the last day or two, and read the comments you'll see that more folks are running "ridiculous combos" than are running proper setups so maybe more people need to point out the "why".
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Old 02-06-2014, 08:54 AM   #11
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You can tell by someone's avatar? Dang!

I have eyes and can see that the guy doesn't look to be on 35s. Dang!


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Originally Posted by UFOtestpilot View Post
However, if you look at the 5 or so posts about gearing or axles that have been started in the last day or two, and read the comments you'll see that more folks are running "ridiculous combos" than are running proper setups so maybe more people need to point out the "why".

I don't recall anyone claiming to run 35s and 3.07s.
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Old 02-06-2014, 09:06 AM   #12
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Hey dude, have a good day ok?
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Old 02-06-2014, 09:08 AM   #13
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And use your eyes to re-read the part where I prefaced; "an EXTREME example would be..."
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Old 02-06-2014, 09:23 AM   #14
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Hey dude, have a good day ok?
Quote:
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And use your eyes to re-read the part where I prefaced; "an EXTREME example would be..."

Don't leave all butt-hurt now. Dang!
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Old 02-06-2014, 09:44 AM   #15
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Don't leave all butt-hurt now. Dang!
I'm not the one getting personal.

Back in topic for the OP though:

Proper gearing for your tire and transmission is vital, and is ALWAYS an improvement, no matter how many ignorant people try to state otherwise. Physics and math will be more correct than anything anyone else says, including me.
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Old 02-06-2014, 07:53 PM   #16
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Like I said,Im very happy with my 4.56 gears.What a world of difference from stock,on & off road.

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