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2023 Xtreme Recon 3.6 w/ 37's?

bthomp

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I have seen similar threads, however reading through there is nothing recent and nothing that quite addresses my situation so wanted to throw it out for feedback. I'm not ready to buy now, but when I need to buy new tires I know I'm going to be very tempted to go to 37's as I believe that my rig is already built to be ready for them (but I could be wrong).

Here are the stats on my rig:
  • 4.88 rear gears
  • 8-speed automatic transmission; 4:1 rock-trac
  • 3.6L eTorque
  • 5 year SiriusXM Travel Link subscription. LOL, j/k.
I believe 4.88 makes this entirely workable, but is it just barely enough and I really need 5.12? Are the XR shocks / suspension / braking system sufficient or do I need to go higher to avoid rubbing at flex?

This is also my family's daily driver, so need to keep it suitable for that purpose.

Anyone with 37's in a similar setup, would appreciate you sharing your insight;
  • MPG. I'm at 16.5-17 mpg now, does this send me down to 14-15? Worse???
  • Drivability. My JLUXR drives fantastic, I have zero complaints. Will going to 37's make that worse (even better would be great :) )?

As always, thanks all -

Bill
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4.88’s and 37’s, you’re good 👍 especially with the 8-sp.
 

CoFlyFishing

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I’ve got a 2019 jlur, 3.6 w/out the etorque. 2.5 lift with 37s. I can’t speak to the 4.88, but 5.13 is amazing from my experience. Mpg is variable dependent upon driving habits. My wife got 14.5 with the 4.10 and 14.5 with the 5.13. When I drive, I probably lost half an mpg and float around 15.5. Nothing more than 3-5 mile trips at a time in our little area. Recent trip Denver to Moab we averaged 16.5 per the gauge cluster. Speaking of that, I guess your altitude weighs into the equation too… along with how you want to spend your mod $.
 

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kah.mun.rah

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I would run the 4.88 first and see how you like it. 5.13 is a thinner/weaker tooth compared to 4.88 so if 4.88 is ok by your standards, terrain, vehicle weight, etc., I would stick with it.
 

JMP

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I have exactly the same jeep as you. Im running 37” KO2 on 4.56 and have no complaints. 4.88 is ideal for them tho.

Be sure to get a tazer and reset your tire size. Ignore the numbers. Just change them until your speed matches a GPS. This fixes many things. Your speed, your mpg accuracy, and most importantly, your shift points.

I hope you have 4.88 in the front diff too…

I’m finding that MPG is dependent on tire pressure more than ANYTHING else. I’m lifted 3.5”. At 30psi, on the highway I was having a hard time getting out of 7th and was getting 15mpg. I bumped it up so they were 34-35psi warm, and I was in 8th all day and got 20mpg. No shit. People don’t appreciate what a different tire pressure makes! A local guy is running 37” Baja Bosses at 26 psi and getting 14-15 highway in a 4XE 😳
 

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I have a 21 eTorque, 4.88, 37 BFG KM3s, 8 speed, Tazer.
I am happy with 4.88, 5.13s would have been Ok also.
Happy with MPGs Highway close to 17
3.6 is a poor motor with no power on the highway.
 
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bthomp

bthomp

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Yea... I saw those.
I have exactly the same jeep as you. Im running 37” KO2 on 4.56 and have no complaints. 4.88 is ideal for them tho.

Be sure to get a tazer and reset your tire size. Ignore the numbers. Just change them until your speed matches a GPS. This fixes many things. Your speed, your mpg accuracy, and most importantly, your shift points.

I hope you have 4.88 in the front diff too…

I’m finding that MPG is dependent on tire pressure more than ANYTHING else. I’m lifted 3.5”. At 30psi, on the highway I was having a hard time getting out of 7th and was getting 15mpg. I bumped it up so they were 34-35psi warm, and I was in 8th all day and got 20mpg. No shit. People don’t appreciate what a different tire pressure makes! A local guy is running 37” Baja Bosses at 26 psi and getting 14-15 highway in a 4XE 😳
VERY helpful insight, thank you. I have no idea what my front diff has, will need to look into that. It came factory with the 4.88's, so if they are supposed to match, I would assume they match. Will do some research. I would likely go 37" KO2 as well, which I understand is a bit smaller than other 37's. Did you ever happen to run the 37's before you put the 3.5" lift on? I know I should be good without an additional lift, but curious how it was in practice.
 

JMP

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Yea... I saw those.

VERY helpful insight, thank you. I have no idea what my front diff has, will need to look into that. It came factory with the 4.88's, so if they are supposed to match, I would assume they match. Will do some research. I would likely go 37" KO2 as well, which I understand is a bit smaller than other 37's. Did you ever happen to run the 37's before you put the 3.5" lift on? I know I should be good without an additional lift, but curious how it was in practice.
They need to match or you’ll bind up in 4WD. If it’s factory then they match.

I didnt, but I don’t need any bump stop beyond the factory XR bumps except maybe 1/2” in the rear. I have zero rubbing.

Yours must be a 2024 with the 4.88. Hopefully the bumps are the same as the 2023 XR.
 

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bthomp

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They need to match or you’ll bind up in 4WD. If it’s factory then they match.

I didnt, but I don’t need any bump stop beyond the factory XR bumps except maybe 1/2” in the rear. I have zero rubbing.

Yours must be a 2024 with the 4.88. Hopefully the bumps are the same as the 2023 XR.
Actually mine is a 2023. Not sure how the 4.88 happened, I understand it's unusual, but glad it did. I didn't custom order, someone else did then they didn't pull the trigger when it arrived, so I ran quickly to grab it :).

Jeep Wrangler JL 2023 Xtreme Recon 3.6 w/ 37's? Screenshot 2023-12-08 at 8.49.59 AM
 

JMP

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Huh. It was a $900 option too. On top of the $4000 XR option which included 4.56… you paid for gears twice. Weeeeeird.
 
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bthomp

bthomp

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Huh. It was a $900 option too. On top of the $4000 XR option which included 4.56… you paid for gears twice. Weeeeeird.
Lovely.... Jeep's prices are so good, it's still a bargain when paying twice.... if only that were true.
 
 



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