Re-gear opinions 2020 JL Wrangler Pentastar 6spd manual

Rockywoolf

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I believe that’s the JK chart. If you’re wanting to wheel, my suggestion is to find some take out rubicon axles and run the 4.10s. If you want to move up to 35s or more you’ll be back in the same boat as it being short on power on the highway though. 4.88s are a good pairing to 35s. We have 5.13s with 37s on my 6 speed and I think it’s a great match

Brett
I too put 5.13s on my manual and put 37s on. Made a world of difference. I could not be happier.





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Rockywoolf

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I bought a JT, put 37s on it with 5:13 gears, here is a snapshot of the dash
1610124352179.jpeg
 

word302

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It is horrible, especially with my boat/trailer, which is light. Even unladen it is bad. I have no clue why they went so tall with it, as it has zero to do with CAFE.
Isn’t reverse even higher in the JK? I can’t imagine trying to back anything up with a higher reverse.
 

word302

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I agree it's atrocious jeep set up non Rubicon models with 3.45 gears. Regearing is a necessity there.

But 4.10 gears are perfectly adequate for the average guy running 37s with a manual. I considered seriously regearing for a while, 4 hi and hill climbs wasn't pleasant. But I realized I could shift to 4 low and start in 4th and run up to 6th rather than pay 2k to stubbornly use 1st in 4 hi.

In the end, final drive is what matters, the ratio of rpm to ground speed. It doesn't matter if you regear the axles or choose a different transmission and transfer case combination, it's all about the math and final drive.

If you have $2000 burning a whole in your pocket, by all means regear your axles. But if you have a harder time supporting your wheeling addiction, take full advantage of the gear spread available to you, and spend that money on something more useful
You must live in a flat world. Even with small inclines I was dropping to 3rd gear on the Highway to get any kind of acceleration with 37s and the stock 4.10 gearing.
 

word302

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yeah, im
Pretty happy with 4.56 and 315/70r17
can use 6th easy at 60/65mph

also part reason is at 4.56, i believe the pinion ring gear is larger. Once you go to 4.88/5.13 etc they become smaller(weaker)

will need more gearing if i go 37s.
Have you seen the new 5.13 pinions? They are massive. You’ll break all kinds of other parts before you even think about breaking a pinion, even with 5.38s.
 

Rockywoolf

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1610135619358.jpeg

From my 2018 JLUR on 37s with 5.13 gears. Manual trans
 

OBJLU

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I moved to 39's, the 5.13's still pull pretty nice. Looking at swapping in a semi-float 60 if the price is right, if that happens I MIGHT go with 5.38's but then the concern is the ring and pinion because I'm keeping my 44 front.
 
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My two cents, have the 3.6L Sport S manual mated to a 4.88 and 35s. Perfect match. 4.56 would be too high yet, and while 5.13 would be nice you'd be revving your engine on 80 mph highways. I'd recommend 5.13 on 37s.

Regearing and tires was the best money spent, by far.
 

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