Gears for 35" tires - JeepForum.com
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post #1 of 31 Old 09-22-2014, 09:45 PM Thread Starter
NumbSkull
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Gears for 35" tires

I'm getting ready to regear and beef up my axles for 35s, and I'm not sure which gearing to go with.

I have an 05 LJ with an I6 4.0L and a 6 speed manual trans. I'm building the rig to be comfortable on trails and rocks. I will drive it on road, but paved performance is a 2nd priority.

I was thinking 4.88 gears is what I'll need, but it sounds low and a few of the gearing calcs lean more towards 4.56.

What's the preferred gearing for a setup like this?

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post #2 of 31 Old 09-22-2014, 10:19 PM
RockMonster
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I would go with the deepest gears I could for the wheeling I do. Especially if on road performance is second to off road. There really isn't a huge difference between the 2 gears on road but if your going to be playing in the rocks I'd go 4.88

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post #3 of 31 Old 09-22-2014, 10:20 PM
geroux
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I have 4.88's on my '04 with a 5 speed and 35's and sometimes wish I went 5.13. I wouldn't go higher (numerically lower) than 4.88. But you may want t hear from others with the 6 speed.
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post #4 of 31 Old 09-23-2014, 12:45 AM
Davetha
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I've had both 4.56 and 5.13 on 35's. I would definitely go with 4.88 over 4.56.
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post #5 of 31 Old 09-23-2014, 01:42 AM
plumber1
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I am running 4:88's in my 05 Rubicon w/ a 6 speed and 35's and love it. Now my Rubi came with 4:10's so to upgrade to 4:56 was only one step up and not enough. I know the Rubi's also have a deeper geared TC than a std TJ but even so I don't use 1st gear much in Low Range but when I need to crawl it is great. So to answer your ??? go with 4:88's and you will love having the power returned back that the 35's steal from you for highway driving

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post #6 of 31 Old 09-23-2014, 04:48 AM
brokenyoujoint
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I had 4:56's in my 5 spd tj on 35's for many yrs, wishing I went to 4:88's. About a yr ago I moved up to 4:88's and noticed a little bit of a difference but nothing Earth shattering. If it's your daily driver and your wheeling is moderate to difficult (not extreme and not a trail only rig) I would go with the 4:88's. If your more of a recreational only rig then the 5.13 is the way to go. I like my 4:88's around town and it does well offroad.
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post #7 of 31 Old 09-23-2014, 05:50 AM
robncar
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I would recommend 4.88's for your combination.
If you have a Dana 30 front (non-Rubicon), the 5.13 gears some have recommended will not fit, 4.88 is the limit.
Don't even consider 4.56!

https://www.jeepforum.com/forum/f9/diy-alignment-kit-steps-w-pics-2264465/
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post #8 of 31 Old 09-23-2014, 05:58 AM
Andy5150
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I,ve got 4.88,s 35,s with the 5 speed, and I still have to downshift on hills on the highway. With your 6 speeds shorter overdrive, it should be perfect. Do not go 4.56.
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post #9 of 31 Old 09-23-2014, 06:26 AM
The_War_Wagon
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I went 4.56 on my Ramcharger & 35's - if I had to do it again, I'd of gone 4.88's.

If I ever swap axles, I WILL.

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post #10 of 31 Old 09-23-2014, 07:14 AM
TAS
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I'm getting regeared today. Currently I'm running 35's and still have 3.73's from way back, since my jeep's been sitting a while. I'm getting 4.56 since I've driven a few with 4.88 and 4.56, I like 4.56 better for my taste. Since I don't crawl much anymore, I'm thinking about going back to 33's so, 4.56 will be better for me on 33's or, if I leave it on 35's, I'll be good there too.

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post #11 of 31 Old 09-23-2014, 07:45 AM
mrblaine
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Quote:
Originally Posted by NumbSkull View Post
I'm getting ready to regear and beef up my axles for 35s, and I'm not sure which gearing to go with.

I have an 05 LJ with an I6 4.0L and a 6 speed manual trans. I'm building the rig to be comfortable on trails and rocks. I will drive it on road, but paved performance is a 2nd priority.

I was thinking 4.88 gears is what I'll need, but it sounds low and a few of the gearing calcs lean more towards 4.56.

What's the preferred gearing for a setup like this?
I think you should read all the recommendations and immediately dismiss all of them except those who have the same transmission you do. What applies to that particular little beast does not apply to the rest of the transmissions Jeep used.

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post #12 of 31 Old 09-23-2014, 08:33 AM
RandyTJ
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Quote:
Originally Posted by NumbSkull View Post
I'm getting ready to regear and beef up my axles for 35s, and I'm not sure which gearing to go with.

I have an 05 LJ with an I6 4.0L and a 6 speed manual trans. I'm building the rig to be comfortable on trails and rocks. I will drive it on road, but paved performance is a 2nd priority.

I was thinking 4.88 gears is what I'll need, but it sounds low and a few of the gearing calcs lean more towards 4.56.

What's the preferred gearing for a setup like this?

I also have a 05 LJ, six speed, but mine is a Rubi. I have factory 4:11 gears, 35" MTR's

I very seldom use 1st gear and always start out in 2nd unless I am on an incline. 1st is so low I do not even drive the length of my jeep and it is time to shift. No problem running 60-70 in 6th gear.
But where I live it is very flat....... no hills or mountains.

Just a guess, but I would go 4:56.

White 2005 LJ, Rubicon, Rubicon Express 3.5 SuperFlex, Goodyear 315/75/16 MTR's, Pro Comp 97 16x8 wheels, UCF Tummy Tuck, 1" Prothane BL, 1" JKS MML,Tereflex Disco's, 10,000 lb. winch. CB Radio, Fire Extinguister, Synthetic Fluids, Driving Lights....
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post #13 of 31 Old 09-23-2014, 11:35 AM Thread Starter
NumbSkull
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Thanks for the suggestions!!


Quote:
Originally Posted by mrblaine View Post
I think you should read all the recommendations and immediately dismiss all of them except those who have the same transmission you do. What applies to that particular little beast does not apply to the rest of the transmissions Jeep used.
Thanks Blaine,

I'm hoping to find more users with similar setups to mine to see what their experiences are. I know the rubicons have different TC gearing and pre-2005 TJs have a 5 speed trans. All this can make a difference in the outcome on performance when considering diff gears.
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post #14 of 31 Old 09-23-2014, 12:50 PM
Shakey
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I have the same transmission that you do, but different transfer case. I also have heavy 35" MTRs on beadlocks. I went with 4.56s. The majority of people I talked to told me to go with 4.88s. None of those people has the same transmission that I or that you do. Research it for yourself and try to drive some Jeeps with various gearing combinations to decide what you'll like.

The NSG-370 has a first gear ratio that's 4.459. http://www.advanceadapters.com/tech-vault/nsg-370/
The NV3550 has a first gear ratio that's 4.01.
http://www.novak-adapt.com/knowledge/nv3550.htm
The AX15 has a first gear ratio that's 3.83
http://www.novak-adapt.com/knowledge/ax15.htm

With the 4:1 transfer case, my crawl ratio is 81:1. http://www.4lo.com/calc/gearratio.php

I often and currently daily drive my Jeep. I don't tow it to the trails, so I needed to be able to drive 75mph on the highway. I don't regret 4.56s and have been really happy with the results of the regear. 4.88s would have made it fairly annoying to drive around town and on the highway, and would have had only a marginal difference in crawl ratio.
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post #15 of 31 Old 09-23-2014, 02:21 PM
LeeMasterGT
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I always like using this calculator: http://www.grimmjeeper.com/gears.html

Inputs the information for you so there's less chance of error. And you can compare two different ratios side by side. All sorts of inputs to play around with. Personally I'm going to go with 4.56s when the times comes. But I would like to drive 75 MPH to Moab and back, and I have a Rubicon so it's a little different. That's why I just let the numbers do the talking and not the folks on the forum. Everybody will have a different opinion as to what is best because we all prefer different things.

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