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Old 12-12-2019, 09:08 PM
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Gearing selection...I know...but please help.

So I’ve read a lot of the forums and it seems like someone jumps in with the strongest opinion, and now you have a separate 4.10, 4.56, 4.88 and 5.13 post. My goal is to get a little more specific to my needs/desires with some constructive advice. So here goes...

What I have:
06 LJ Rubicon 6 speed
4.10
35” KM3s on 15” wheels
Poison Spyder front and rear bumpers and rock rails

It’s not a daily driver, but the trails are 1-2 hours worth of freeway and country roads worth of driving away. Most driving is around town, but I do like to be able to run at least 70-75 mph on the freeway when needed.

So I initially thought 4.88 was the way to go. Now I’m not sure after cruising the forums again tonight. I’m far from being a genius at this gear stuff, but one post mentioned the extra weight of the LJ, and that got me thinking about all the weight I’ve ADDED to that with all the heavy duty bumpers, rock rails, winch and 35x12.5 tires I’m running.

So... if I could solicit the constructive opinion of this great group to help me with this specific setup, that would GREATLY be appreciated. Again, 6-speed, as some other forums quickly shifted (no pun) from manual to auto in about two sentences.

Thanks all!!!

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Old 12-12-2019, 09:42 PM   #2
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I have an 06 Rubicon not LJ 35" tires and the 6 speed with 4.88's, lots of extra weight i.e. armor, winch etc. I find my gearing to be perfect. Its geared just a hair lower than stock when adjusted for tire size. Second gear starts are the norm, cruises down the highway with no problems I downshift only on the steepest hills. Just my 2 cents worth.

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Old 12-12-2019, 10:11 PM   #3
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4.88 gears here and my setup is very similar to yours. 05 LJ rubicon 6-speed manual with 35” mtrs on 15” wheels.
My rig is on the heavy side, about 400lbs of skids and armor. I find the 4.88 just right and would go with that same size again if I had to do it over. Going up mountain passes, I need to shift into 4th gear going 70mph, regardless whether I was running 4:10s or 4:88s.
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Old 12-12-2019, 10:55 PM   #4
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I assume 4.56 is your other consideration? Just go 4.88 and be done
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Old 12-12-2019, 11:09 PM
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I assume 4.56 is your other consideration? Just go 4.88 and be done
Well, that’s what the forum I was reading tonight was all about. Hence my confusion and post above here. I wasn’t even originally considering 4.56 to be honest. Seemed like there was several places where it mentioned that the difference between 4.56 and 4.88 was minimal, about 200 rpm or so.
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Old 12-13-2019, 12:44 AM   #6
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I would go w 5.13 or 5 38...
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Old 12-13-2019, 06:08 AM   #7
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5.13 and don't look back. I've had two 6 speeds on 35s also.
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Old 12-13-2019, 06:12 AM   #8
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Originally Posted by wrangler_pilot View Post
Well, that’s what the forum I was reading tonight was all about. Hence my confusion and post above here. I wasn’t even originally considering 4.56 to be honest. Seemed like there was several places where it mentioned that the difference between 4.56 and 4.88 was minimal, about 200 rpm or so.
4.88 should be the minimum. My Rubi is light and I have 5.13 gears.
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Old 12-13-2019, 10:26 AM   #9
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Another vote for 5.38s. You'll be fine at highway speeds with that deep of ratio
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Old 12-13-2019, 04:05 PM
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5.38 for real? I think I’d limit myself to 5.13 at the moment. I’m not planning on going to 37s and I’m thinking 5.38 would be a bit much. Can someone explain why 5.38 or 5.13 would be the way to go as opposed to 4.88. I wasn’t expecting 5.38, but I do invite a more scientific explanation as to why I should. Thanks.
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Old 12-13-2019, 09:48 PM
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Thinking 4.88 vs 5.13 unless convinced otherwise.
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Old 12-13-2019, 11:11 PM   #12
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Maybe you've see this, maybe not...

https://www.quadratec.com/c/referenc...r-larger-tires
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Old 12-13-2019, 11:41 PM
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Maybe you've see this, maybe not...

https://www.quadratec.com/c/referenc...r-larger-tires
Yes, I have seen that and a few other similar charts. Thank you though!
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Old 12-14-2019, 11:19 AM   #14
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http://www.4lo.com/ca

That's the calculator I use.

I have 2004 LJ on 35s with 5.13. My tires set at the pressure I run and while supporting the weight of the jeep measure closer to 34-34.5. I wouldn't recommend any more than 5.13. My auto has a .69OD, which is higher than your 6 gear, .76 IIRC. The difference in our final drive is worth about 200rpm. My gearing is adequate, in the mountains, steep hills and strong head winds, its HP I'm lacking.

I'm running about 2500rpm at 70
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Old 12-17-2019, 12:04 PM   #15
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5.13 would be my vote. I have 5.13's with an AX15 and 33's runs the Blue Ridge and Smoky mountains just fine. The extra 150-200 rpm that 5.13 gives over 4.88 won't even be noticeable on the freeway except when it comes time to get up a hill at speed.
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'94 YJ 5sp 5.13, Super 35, HP30 w/Aussie, sitting on 33's, RE chromo drag link, 9500 Lb winch, 3" lift, 4x4 Posi Lock, it's a resto-mod in progress.
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Old 12-17-2019, 08:27 PM   #16
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Originally Posted by Audibahn View Post
4.88 gears here and my setup is very similar to yours. 05 LJ rubicon 6-speed manual with 35” mtrs on 15” wheels.
My rig is on the heavy side, about 400lbs of skids and armor. I find the 4.88 just right and would go with that same size again if I had to do it over. Going up mountain passes, I need to shift into 4th gear going 70mph, regardless whether I was running 4:10s or 4:88s.
What would your rpm's be with 4.88 gears going 70mph in 4th gear with a 6-speed? Close to the redline?
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Old 12-17-2019, 08:54 PM   #17
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Originally Posted by Out West Rubi View Post
What would your rpm's be with 4.88 gears going 70mph in 4th gear with a 6-speed? Close to the redline?
Gear Ratio Calculator

You'll never need to ask that again...
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Old 12-17-2019, 10:48 PM   #18
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Originally Posted by Out West Rubi View Post
What would your rpm's be with 4.88 gears going 70mph in 4th gear with a 6-speed? Close to the redline?
Not at redline yet. About 4100rpm on 35s.
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Old 12-18-2019, 01:36 AM   #19
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04 LJ with auto trans here with 5.5” long arm lift, bumpers, winch, armor, sliders & bolt in cage on 37’s with 4.88 gears. My rig is on the heavy end, but I am happy with the 4.88 gears. I can cruise down the interstate at 70-75mph, no issues at a reasonable rpm, & plenty of power to pass/accelerate if needed. For in town driving, normally I will hit the button to shut off OD, at lower speeds sometimes it will shift into OD sooner than I would like, its not horrible, just slightly lugs the motor more than I like. Sometimes I forget to hit the OD button & it’s no big deal though too. For offroad I usually always use 4L, & it is perfectly adequate for deep mud or sand.
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Old 12-18-2019, 02:10 PM   #20
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4.57 and 35"s would get you very near stock RPM at same speed, so with the extra weight, I'd say 4.88 minimum. 4.88 will bump you RPMs by about 200 at 70-75 mph. 5.13 would put you pretty close to 3,000 RPM at 70 mph, which the 4.0L will do all day long, but your gas mileage will start to be impacted for little or no benefit - especially with the NP241 ratio. Anything over 5.13 will not be enjoyable anywhere over 70 mph.


I'm running 4.88 with 35"s and think that ratio is the sweet spot for combined road/trail use, but I've got auto trans, so not the same setup. The 6-speed will actually give you higher RPMs at top gear than on the auto, which will benefit higher speed driveability. I say go with 4.88.
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Old 12-19-2019, 11:42 AM   #21
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'03 TJR, running 35's...have 4.88's runs down the road at 70 no problem...and works great off road which was more my concern...
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Old 12-20-2019, 08:40 AM
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Ok, so I’m likely choosing 4.88. Next question is what brand did everyone choose and why?
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Old 12-20-2019, 04:28 PM   #23
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Revolution Gear, American made.

I also purchased their lifetime warranty shafts, front and rear and timken bearing kits. It just made sense to buy their gears while on the phone
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Old 12-21-2019, 06:02 PM   #24
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Ok, so I’m likely choosing 4.88. Next question is what brand did everyone choose and why?
Revolution Gear. Their R&P gears are made in S. Korea by Circle K which is the current best quality manufacturer for aftermarket R&P gears. Some other gear providers like Yukon also source their gears from Circle K but not all of them, it's the luck of the draw if you get Circle K. With Revolution Gear 100% of their gears come from Circle K.

So far as the above American made comment, it's Revolution Gear's lifetime axle shafts that are American (Los Angeles) made. Their gears are not American made.
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Old 12-21-2019, 08:28 PM   #25
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Hmmm, I didn't know that. Doesnt change anything for me, I'm quite happy with my purchase!
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