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post #1 of 11 Old 01-26-2014, 03:56 PM Thread Starter
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2013 Gears

I am going to be re-gearing and adding at least one locker shortly. The shop(LLoyds) I have always had re-gear my street trucks( they do alot of Jeeps also) recommended 5.13 gears.

I friend of mine has a 2011 with 4.88's who hates those gears on the freeway going up hill like to Flagstaff from Tucson.

I am not sure of the differences if any on the OD from 2011 and 2013. I was wondering if anyone has 5.13 in a 2013 and how they run on the freeway and steep grades etc.

This is a daily driver so I need that lower gear that is still freeway friendly.
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post #2 of 11 Old 01-26-2014, 03:59 PM
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The gearing difference is pretty substantial from a 2011 automatic to a 2013 automatic [assuming its an automatic]. If they are both manual transmissions, then the cruising rpm will be the same if the axle ratio/tire size is the same.

What does your friend hate about the 4.88s? Lack of "power"? Too high of cruising rpm?

What size tire do you have?

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post #3 of 11 Old 01-26-2014, 04:18 PM Thread Starter
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Quote:
Originally Posted by Goodysgotacuda View Post
The gearing difference is pretty substantial from a 2011 automatic to a 2013 automatic [assuming its an automatic]. If they are both manual transmissions, then the cruising rpm will be the same if the axle ratio/tire size is the same.

What does your friend hate about the 4.88s? Lack of "power"? Too high of cruising rpm?

What size tire do you have?

They are both automatics. I am running 35x12.50x17 MT tires. Lloyds is estimating that at freeway speeds I would be in the 2500 rpm range which I am fine with.

My friend with the 2011 is @ 2500 RPMS at 75 mph. But he says if he hits up hill grades he in the slow lane with the Semi trucks @ 45mph etc...which he hates.
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post #4 of 11 Old 01-26-2014, 05:06 PM
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Quote:
Originally Posted by sstoner View Post
They are both automatics. I am running 35x12.50x17 MT tires. Lloyds is estimating that at freeway speeds I would be in the 2500 rpm range which I am fine with.

My friend with the 2011 is @ 2500 RPMS at 75 mph. But he says if he hits up hill grades he in the slow lane with the Semi trucks @ 45mph etc...which he hates.
5.13s in your JK will be around like 2900rpm at 70mph [2500rpm @ 60mph].

2900 at 70 is pretty steep, the power curve between your 3.6L and your friends 3.8L is pretty drastically different. You also have one more gear than he does, so a downshift is less of a significant ratio change as his. I'd say lean more toward the 4.88 range for your rig. That being dependent on 35s being the biggest you plan on going.

http://www.4ws.com/gear-ratio-rpm-calculator

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post #5 of 11 Old 01-26-2014, 05:20 PM
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4.88's
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post #6 of 11 Old 01-27-2014, 07:58 AM Thread Starter
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Quote:
Originally Posted by Goodysgotacuda View Post
5.13s in your JK will be around like 2900rpm at 70mph [2500rpm @ 60mph].

2900 at 70 is pretty steep, the power curve between your 3.6L and your friends 3.8L is pretty drastically different. You also have one more gear than he does, so a downshift is less of a significant ratio change as his. I'd say lean more toward the 4.88 range for your rig. That being dependent on 35s being the biggest you plan on going.

http://www.4ws.com/gear-ratio-rpm-calculator
I was looking at this chard and there is only like 100 rpm difference between 4.88 and 5.13....

If thats the case I would just go 5.13. 35's are the bigges tire i plan to run.

Last edited by sstoner; 02-21-2014 at 07:39 PM.
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post #7 of 11 Old 01-27-2014, 12:24 PM
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I am still on the fence myself between 4.88 and 5.13. I have a manual and plan on a Magnuson blower at some point so will probably end up with the 4.88s.

It is not terrible now with the pentastar and 4.10s.

What I have found with some folks recommendations to go with 5.13 is that they are doing so with the 3.8L motor in mind.

What helped polarize me (to the 4.88 side) was to cruise in a gear where I matched the desired speed and RPMs up the best I could to the chart. What I found was the lowest gear ration for me that would also not exceed my maximum level of tolerance for cruising on the highway (with respect to engine noise and driving in the green zone). For me, that was about 3300 RPM and I think 65 MPH.

With 4.88s, 37" tires and a manual trans this is just about where a stock rubi would be and that works for me.

Crawl speed with 4.10's and 35" MTRs was not terrible. Very livable IMHO.


The other exercise that I found helpful was busting out the yellow writing thingy and doing the math where you measure the circumference or radius and figure it all out.
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post #8 of 11 Old 01-27-2014, 01:38 PM Thread Starter
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Quote:
Originally Posted by White13JKUR View Post
I am still on the fence myself between 4.88 and 5.13. I have a manual and plan on a Magnuson blower at some point so will probably end up with the 4.88s.

It is not terrible now with the pentastar and 4.10s.

What I have found with some folks recommendations to go with 5.13 is that they are doing so with the 3.8L motor in mind.

What helped polarize me (to the 4.88 side) was to cruise in a gear where I matched the desired speed and RPMs up the best I could to the chart. What I found was the lowest gear ration for me that would also not exceed my maximum level of tolerance for cruising on the highway (with respect to engine noise and driving in the green zone). For me, that was about 3300 RPM and I think 65 MPH.

With 4.88s, 37" tires and a manual trans this is just about where a stock rubi would be and that works for me.

Crawl speed with 4.10's and 35" MTRs was not terrible. Very livable IMHO.


The other exercise that I found helpful was busting out the yellow writing thingy and doing the math where you measure the circumference or radius and figure it all out.
I am running 3.73's now and with the 3.6L its not bad. On the trail is where I will see the biggest improvement with the 5.13's.

In town will be better also...right now its tolerable.
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post #9 of 11 Old 01-27-2014, 01:46 PM
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4.88 seems right for the 3.6 and 35's. But that's me.

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post #10 of 11 Old 02-12-2014, 08:13 PM
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Just got mine back today from a regear. It's still breaking in but I got to about 65mph at 2500 rpm and the econo light was on. I went 5.13 for my 2013 manual trans with 37" MTRs and it feels like the right choice so far.
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post #11 of 11 Old 02-15-2014, 07:08 AM
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Quote:
Originally Posted by White13JKUR View Post
Just got mine back today from a regear. It's still breaking in but I got to about 65mph at 2500 rpm and the econo light was on. I went 5.13 for my 2013 manual trans with 37" MTRs and it feels like the right choice so far.

That validates the chart above. I think the best way to determine gearing is to decide what you are going to do with your vehicle and where. Also how much more weight are you going to add as well. think preference plays the final decision maker Go drive some of your friends rigs

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