Impressions from a 5.13 gears install on a JL Wrangler Unlimited Rubicon (JLUR)

mgroeger

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Out of curiosity, what made you settled on 5.13s vs. 4.88s?
Holy cow are you kidding me?! This debate has been raging on multiple threads for years and you will find ardent supporters for each side of this debate... lol. You might as well have asked "Why is blue your favorite color and not green." :)
 

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I read this entire thread and it definitely made me question my gearing plans. I had been planning on 4.88's for the last 2 years and after reading this and doing some math, I have decided on 5.13s mainly because I miss the pep that the Jeep had when it was new. My appointment is thursday.

I live in FL and we travel 80mph everywhere on the highway (it's the flow of traffic). I'm currently stuck in 7th gear at that speed with 37's and 4.10s. Looking at the math, I will be at essentially the exact same RPM with 5.13's in 8th. I expect a slight decrease in mpg based on my driving style, but overall confident that 5.13s are the right choice. I will definitely be posting back here after they are on the Jeep for a while to report my findings. I currently average about 16mpg with mostly highway driving at 80mph and some city driving.

Here is a great calculator link for others to check out: https://www.desmos.com/calculator/kanrlanh26
 

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I read this entire thread and it definitely made me question my gearing plans. I had been planning on 4.88's for the last 2 years and after reading this and doing some math, I have decided on 5.13s mainly because I miss the pep that the Jeep had when it was new. My appointment is thursday.

I live in FL and we travel 80mph everywhere on the highway (it's the flow of traffic). I'm currently stuck in 7th gear at that speed with 37's and 4.10s. Looking at the math, I will be at essentially the exact same RPM with 5.13's in 8th. I expect a slight decrease in mpg based on my driving style, but overall confident that 5.13s are the right choice. I will definitely be posting back here after they are on the Jeep for a while to report my findings. I currently average about 16mpg with mostly highway driving at 80mph and some city driving.

Here is a great calculator link for others to check out: https://www.desmos.com/calculator/kanrlanh26
How are you liking the 5.13s?
 

Khsonic03

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How are you liking the 5.13s?
So far, loving them. Still in the break-in period (have put on 250 miles), so I don't have a full impression yet. What I've noticed is that the jeep no longer has the "laggy" feeling it had before when I'd step on the gas; it just goes. Top speed I've been able to do is 60mph and I'm seeing 19-20mpg at that speed.

The jeep loves 8th gear now as well. Went offroading at Ocala National Forest yesterday so the front gears could get broken in a bit before the 500 mile drain and fill (The front ring and pinion don't move in 2wd because of the FAD). It does great on the trails.

Can't wait to finish break in and really try them out and get it up to 80mph. Will post back again.
 

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I would suggest any one doing gears , look into dealer pricing before getting an independent shop to do your gears.only due to FCA cancelling all power train warranty.Due to aftermarket parts .
 

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I would suggest any one doing gears , look into dealer pricing before getting an independent shop to do your gears.only due to FCA cancelling all power train warranty.Due to aftermarket parts .
They are not going to cancel your power train warranty. What some of us are seeing is they won't cover the axles or anything in the diff. Having a dealer do it is not something I would do. You want a shop that does this for a living. Most techs don't have experience with gears.
 

jeepsity

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They are not going to cancel your power train warranty. What some of us are seeing is they won't cover the axles or anything in the diff. Having a dealer do it is not something I would do. You want a shop that does this for a living. Most techs don't have experience with gears.
Is that why dealer rates are so low
 

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They are not going to cancel your power train warranty. What some of us are seeing is they won't cover the axles or anything in the diff. Having a dealer do it is not something I would do. You want a shop that does this for a living. Most techs don't have experience with gears.
This is also what I've found after doing an axle swap.
 

ChattVol

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I would suggest any one doing gears , look into dealer pricing before getting an independent shop to do your gears.only due to FCA cancelling all power train warranty.Due to aftermarket parts .
No....FCA will not void your powertrain warranty on your transmission and transfer case because you regeared. Also, reputable shops that specialize in gear swaps are going to warranty their work. I've been on this forum for over 2 years and haven't read where anyone has let a dealer regear their diffs. I'm about to regear to 5.13 and am going with a local axle shop that has previously regeared 5 JL's. Did you let a dealer regear your JL?
 

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Let’s not forget all of the posts from owners that had their Jeeps in for a simple oil change and it was over filled .... heard that one SEVERAL times.... And what about several reports of the technicians that they use at dealerships barely know how to turn a wrench and are hired right out of high school with not much experience at all.... you want them re-gearing your rig ??
 
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I would suggest any one doing gears , look into dealer pricing before getting an independent shop to do your gears.only due to FCA cancelling all power train warranty.Due to aftermarket parts .
Really, you would trust a dealership to do gears? You have to be kidding right? Most of them can't even get an oil change right. There is no way my Jeep would go to the dealership for a gear change. Hell Jeep will not even let the dealership take the diff cover off the axles. That is why Jeep swaps the whole axle assembly out when the sensor goes bad in a Rubicon.

Once again, there is no way that a dealership would touch my Jeep for a gear change.
 

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