37s on xtreme recon package?

[kah.mun.rah]

Then I'm predicting JEEP will offer 37s soon.

Now that they offer a factory 4.88 axle ratio, the next step in offering 37s would make sense.

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[J0E]

Now that they offer a factory 4.88 axle ratio, the next step in offering 37s would make sense.

Maybe with a Dana50 front/rear too. At least in the rear like the Raptor.

 

[jack bauer]

Loving the XR with 37s.

 

[Jeepeto]

Do you have a link to the differences between the DJV and DJF front axles? The rear axles are the same DRF.

I think what @Stormin’ Moorman might mean what many others have asserted, if you're after 37's or higher, just get the regular Rubicon.



I'll bet we won't see that before 2027. It makes too much sense and the bean counters are risk averse. Unless the Bronco is available with 37s.

It’s been discussed, essentially thicker tubes on the axles, bigger brakes, and iron steering knuckles.

Everyone is different, but it’s got value for a lot of people. I saved money on my rig with the XR and had it on 37s within 2 weeks of taking delivery.

 

[Jtphoto]

The XR also bumps up the GVW from 5800lbs to 6100lbs.
there is a lot of value in that XR package.

 

[OBJLU]

Maybe with a Dana50 front/rear too. At least in the rear like the Raptor.

It’s going to be a 5 lug 60, semi float rear.

 

[SLORubi]

The XR also bumps up the GVW from 5800lbs to 6100lbs.
there is a lot of value in that XR package.

That 6100lbs comes in handy for some ?

 

[Zandcwhite]

That 6100lbs comes in handy for some ?

Guess how many times your non commercial wrangler is going to get pulled into a dot scale and weighed where they have no jurisdiction over your vehicle? It rhymes with hero...

 

[Jtphoto]

Guess how many times your non commercial wrangler is going to get pulled into a dot scale and weighed where they have no jurisdiction over your vehicle? It rhymes with hero...

All it really means is the XR is around 300lbs heavier.

 

[MARTY J]

What is silly is spending that much money on an upgrade package with the intention of having it less than ideal. If you're going to run and wheel 37s, 4.88 should be the minimum. Maybe 5.13s, depending on your use case. But what do i know?

What is silly is spending that much money on an upgrade package with the intention of having it less than ideal. If you're going to run and wheel 37s, 4.88 should be the minimum. Maybe 5.13s, depending on your use case. But what do i know?

So by your calculations if 4.56 gears in a Rubicon with it's transfer cas

What is silly is spending that much money on an upgrade package with the intention of having it less than ideal. If you're going to run and wheel 37s, 4.88 should be the minimum. Maybe 5.13s, depending on your use case. But what do i know?

To answer your question I would say you know nothing. There is not much on road performance loss with the 8 speed. And also with the 45% more gear reduction of the rubicon transfer off road gearing is not an issue either.

 

[TxJeepers]

I ran 37s on 4.10s. I ran 37s on 5.13s. I am currently running 37s on XR 4.56. All JLRU 3.6/auto.
4.10 - Rarely saw 8th. Dropped to 4th and 5th all the time. Crawl was OK. This is the ratio for the 'I'm too cheap to do a non-flashy upgrade' crowd. Justify it however you want. 4.10 is not the right ratio for 37s.
5.13 - 8th on the highway all the time. Drops to 5th and 6th as needed and expected. Crawl was incredible. Idle over obstacles. Top end not great but I mostly stay below 80 and rarely need to pass on 2 laners. Talk to the gear companies and they'll encourage 5.13s all day long.
4.56 - See 8th a lot. Downshifts more than the 513 but not as bad as 410. Crawl is good. Can tell the difference between the 513 and these 456. Top end is much better. Overall, this is the factory ratio that one can live with on 37s. Not ideal, but a lot closer to what it should be vs 410s. Factory warranty.
4.88s - If I were to regear, this is what i'd go with. I think it would be the sweet spot in terms of crawl and top end for a 3.6/auto/37s. You can find many thread of Jeeps with 488s and very happy.

 

[Zandcwhite]

I ran 37s on 4.10s. I ran 37s on 5.13s. I am currently running 37s on XR 4.56. All JLRU 3.6/auto.
4.10 - Rarely saw 8th. Dropped to 4th and 5th all the time. Crawl was OK. This is the ratio for the 'I'm too cheap to do a non-flashy upgrade' crowd. Justify it however you want. 4.10 is not the right ratio for 37s.
5.13 - 8th on the highway all the time. Drops to 5th and 6th as needed and expected. Crawl was incredible. Idle over obstacles. Top end not great but I mostly stay below 80 and rarely need to pass on 2 laners. Talk to the gear companies and they'll encourage 5.13s all day long.
4.56 - See 8th a lot. Downshifts more than the 513 but not as bad as 410. Crawl is good. Can tell the difference between the 513 and these 456. Top end is much better. Overall, this is the factory ratio that one can live with on 37s. Not ideal, but a lot closer to what it should be vs 410s. Factory warranty.
4.88s - If I were to regear, this is what i'd go with. I think it would be the sweet spot in terms of crawl and top end for a 3.6/auto/37s. You can find many thread of Jeeps with 488s and very happy.

I agree with most of this, but as someone who roadtrips they're JL I will say that 4.10's and 37's was much better on road than 5.38's and 38's. Even the 4.10's and 38's were better. We lost 2-3mpg across the board. Of course it's in 8th gear all the time, from about 50mph and up. I disagree with those that think this is a good thing. I much prefer the jeep mostly cruising in 7th and having the ability to roll at <2k rpms at 80+ down hills and under low loads. Of course it's a rocket off the line now with the 2.0t, but it was quick enough even with the 4.10's. Crawling is where these low gears shine, but with the 4-1 low range even the 4.10's were excellent there. The only place I'd say the deep gears are truly better is 4 hi situations like mud and deep snow where you want wheel speed but still need torque at times. Specifically our tall reverse gear in these situations is what pushed me to regear. I think 4.56 would be perfect for my driving and wheeling style on 37's. Hard to justify such a small gear change for the cost going from 4.56 to 4.88. If I go XR on the next jeep I'll stick with 4.56, but I've been known to roll 90+ on remote stretches of freeway. YMMV.

 

[Steph1]

Not sure not the lift, it's one of my questions for the first owner to take delivery as well. If the wheels are the same as the Mopar accessory wheels offered in the aftermarket its 4.4" BS

But that is a mistake. My brother bought these wheels and we measured backspace with a level and backspacing is 5 inches don’t know where they got 4.4.

 

[Roky]

But that is a mistake. My brother bought these wheels and we measured backspace with a level and backspacing is 5 inches don’t know where they got 4.4.

I don’t know why, but Jeep measures backspace to the inside of the bead lip instead of to the outside of the rim, above my pay grade as to why. But whatever Jeep says is the backspace I just been adding a 1/2” to it and noticed that gives me the actual backspace number………

 

[Stormin’ Moorman]

So by your calculations if 4.56 gears in a Rubicon with it's transfer cas

To answer your question I would say you know nothing. There is not much on road performance loss with the 8 speed. And also with the 45% more gear reduction of the rubicon transfer off road gearing is not an issue either.

Yeah, I don't know anything "Marty". I've just driven across country and wheeled 2 Rubicons on 37s. all over the place. If you want to use all your gears, they need to be taller.

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