5.13s🙀🙀🙀🙀

[suspension]

Finally getting around to lifting and regearing my 25 Mojave. Going 37s. I know 4.88s are most common. Anyone have 5.13s and regret it? Did fuel economy tank after? Is the improved acceleration worth it?

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[md2k]

Have you picked out the 37's you want? Look at their actual height. IF BFG's, those 37's are actually like 35's.

 

[GI Grandpa]

I put 35's on my 21 Mojave with the 4.10 gears and lost 8th gear on the highway. I regeared to 4.88 and got 8th gear back and picked up 2 mpg on the highway and 1 mpg around town and the Jeep drives so much better. I live in Colorado so going a little deeper help compensate for the 7,000' altitude and pulling mountain passes. Keep in mind it is not just the larger diameter but the extra unsprung weight that you're turning.

 

[Wheelin98TJ]

I don't know that I'd say 4.88 is the most common for 37s.

5.13 is common for 37s too.

 

[Panthers65]

I have 5.13's on the lightest/smallest 37" Tire and I love it. It puts the Jeep right where I like it. Theres <5% difference between the 4.88s and 5.13's, so don't think about it too much. But I get 18+ mixed city and HIghway and can easily pull my boat.

 

[suspension]

I have 5.13's on the lightest/smallest 37" Tire and I love it. It puts the Jeep right where I like it. Theres <5% difference between the 4.88s and 5.13's, so don't think about it too much. But I get 18+ mixed city and HIghway and can easily pull my boat.

Nice. I talked to the shop today. They recommend 5.13s. I feel with the 5.13 it gives me flexibility to maybe try 38s or 39s at some point

 

[Siskiyou Recon]

Have you picked out the 37's you want? Look at their actual height. IF BFG's, those 37's are actually like 35's.

So with my new Rubi @ only 1800 miles on it I am of course looking at builds. Love the BFG AT’s and the 37’s sound like a great idea. What advice can you give on running them? I would like to run them but am interested in all the changes needed. Gears at 5.13 and new covers is about as far as I got. Ideas for fit on a Rubicon X ?

 

[Panthers65]

So with my new Rubi @ only 1800 miles on it I am of course looking at builds. Love the BFG AT’s and the 37’s sound like a great idea. What advice can you give on running them? I would like to run them but am interested in all the changes needed. Gears at 5.13 and new covers is about as far as I got. Ideas for fit on a Rubicon X ?

the X will already come with 4.56's, so the jump to 5.13's is going to be pretty minimal. IMO its worth it if you have tons of $, but you won't see as drastic of a change as someone on 3.73's or 4.10s.

and as stated, the BFG AT's are some of the smallest and lightest tires available, so a 37 AT is going to be a bit smaller than other 37's, closer to 35.5". Depending on what tires come on you X factory you may not get as big a change as you are looking for.

light weight does help a lot. I"ve got a set of 37" ATs on aluminum wheels, and a set of BFG MTs on beadlocks, 70lbs vs about 110lbs, and there's a 2MPG Difference between the two, and I can definitely feel the weight difference when driving even with the e5.13's. If I ran the MTs all the time I'd actually prefer a bit deeper set of gears and just keep the speed lower. Trade off slower highway speeds vs a heavier more aggressive wheel/tire combination.

 

[bleda2002]

the X will already come with 4.56's, so the jump to 5.13's is going to be pretty minimal. IMO its worth it if you have tons of $, but you won't see as drastic of a change as someone on 3.73's or 4.10s.

and as stated, the BFG AT's are some of the smallest and lightest tires available, so a 37 AT is going to be a bit smaller than other 37's, closer to 35.5". Depending on what tires come on you X factory you may not get as big a change as you are looking for.

light weight does help a lot. I"ve got a set of 37" ATs on aluminum wheels, and a set of BFG MTs on beadlocks, 70lbs vs about 110lbs, and there's a 2MPG Difference between the two, and I can definitely feel the weight difference when driving even with the e5.13's. If I ran the MTs all the time I'd actually prefer a bit deeper set of gears and just keep the speed lower. Trade off slower highway speeds vs a heavier more aggressive wheel/tire combination.

Gladiator's come with 4.10s even in X format unless something changed in 2026...the 4.56 come with factory 35s which the gladiators don't get.

 

[Panthers65]

Gladiator's come with 4.10s even in X format unless something changed in 2026...the 4.56 come with factory 35s which the gladiators don't get.

Good to know, I thought all the Xs got 4.56 like the wranglers.

 

[WILDHOBO]

Finally getting around to lifting and regearing my 25 Mojave. Going 37s. I know 4.88s are most common. Anyone have 5.13s and regret it? Did fuel economy tank after? Is the improved acceleration worth it?

I have 5.13’s in my rubicon with 37’s. I happen to love them. Fuel is economy? Not good, but I’d attribute that more to the 37’s than the gear ratio difference between 4.88 and 5.13. I see 8th gear a ton, and I run at about 2300rpms at 75mph. At least if I’m not going uphill. Gas mileage is going to tank if you put 37’s on a 3.6 v6. No great way to fix that.

 

[WILDHOBO]

the X will already come with 4.56's, so the jump to 5.13's is going to be pretty minimal. IMO its worth it if you have tons of $, but you won't see as drastic of a change as someone on 3.73's or 4.10s.

and as stated, the BFG AT's are some of the smallest and lightest tires available, so a 37 AT is going to be a bit smaller than other 37's, closer to 35.5". Depending on what tires come on you X factory you may not get as big a change as you are looking for.

light weight does help a lot. I"ve got a set of 37" ATs on aluminum wheels, and a set of BFG MTs on beadlocks, 70lbs vs about 110lbs, and there's a 2MPG Difference between the two, and I can definitely feel the weight difference when driving even with the e5.13's. If I ran the MTs all the time I'd actually prefer a bit deeper set of gears and just keep the speed lower. Trade off slower highway speeds vs a heavier more aggressive wheel/tire combination.

Completely agree on the BFG. Why even spend 37 money on big 35’s.

My MT’s are lighter than the two sets of ATs I used to run when it was my daily. Mickey Thompson Baja boss at in 37x12.5x17 is 80 pounds. The same in the MT is 75 I think. But definitely in the 70’s.

What are you running to get as low as 70lbs including the wheel?

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