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Old 01-07-2013, 08:19 AM   #1
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Will 35" tires work with 4:10 gearing?

Hi. I have an 06 LJ Rubi with automatic & stock 4:10 gearing. I'm in the process of installing an 4" RCD lift, 1.25" BL, 1"mml, TW driveshaft & 35" Dura Trac's. My question is will the 4:10 gearing work ok for a while without burning up my transmission? If I need to I will regear down the road, but just have to start saving back for it. I don't do any major offroading, more of a DD right now with just a little bit of minor offroading / trail riding. Thanks in advance for the help.

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Old 01-07-2013, 08:25 AM   #2
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I have an '02 with 35s and 4.10 with an auto and gave never had an issue.

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Old 01-07-2013, 08:39 AM   #3
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I have your exact set up. Personally mine always wanted to downshift on the highway with any sort of incline. It was a dog in my opinion. I regeared to 4.88 when I upgraded my axles and it was a night and day difference. I used to worry about burning up the tranny having to downshift on the highway so much. When I regeared it woke it up around town and did away with all the shifting on the highway with all but the steepest inclines.

Now when I added the RIPP supercharger....that REALLY woke it up.
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Old 01-07-2013, 09:15 AM   #4
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I have the 6 speed, 4.10s and 35s and its pretty much exactly what I want. I have no plans to regear. I still skip 1st a lot of the time, and now OD is really OD instead of spinning 3000+ rpms on the freeway.
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Old 01-07-2013, 09:19 AM   #5
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It all depends on which auto transmission you have, both DPD06 and Trailsnail are right most likely without being more descriptive. I run a 2000 with a 3 speed auto, 4.10 axles, and 35s and have no problem. I'm sure there could be a difference with the 4 speed autos and the slightly different tcase in the rubis. But it should do you fine for a while. If you find yourself downshifting more often like DPD06 found, just don't use overdrive till its regeared. That will save on the tranny, up your performance, and drop you gas mileage a bit. Hope this helps
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Old 01-07-2013, 10:55 AM   #6
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Thanks for all the advice. I have the 4 spd automatic & in the past I have read on here about just turning off the overide switch will help, so I will do that for sure. I guess I'll start saving money back for a regear to 4.88. I just didn't want burn the transmission up before I could do it.
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Old 01-07-2013, 11:42 AM   #7
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Quote:
Originally Posted by DPD06 View Post
I have your exact set up. Personally mine always wanted to downshift on the highway with any sort of incline. It was a dog in my opinion. I regeared to 4.88 when I upgraded my axles and it was a night and day difference. I used to worry about burning up the tranny having to downshift on the highway so much. When I regeared it woke it up around town and did away with all the shifting on the highway with all but the steepest inclines.

Now when I added the RIPP supercharger....that REALLY woke it up.

That's what I wanted to know for sure. I can't even imagine a SC on a wrangler
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Old 01-07-2013, 11:48 AM   #8
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Have you considered going deeper than 4.88s? Your D44s will accept lower gears than 4.88.
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Old 01-07-2013, 12:14 PM   #9
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Originally Posted by Big Cole View Post
Have you considered going deeper than 4.88s? Your D44s will accept lower gears than 4.88.

No, I haven't. I guess that should be my next question. What would be a good gear ratio to have, since I am going to be running 35" tires?
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Old 01-07-2013, 12:27 PM   #10
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A buddy of mine runs that combo and he has had no problems except it is a little of a dog. Can it work, yes, but not ideal. Run that setup until you can regear and you will be fine.
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Old 01-07-2013, 02:00 PM   #11
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Originally Posted by doclouie View Post
A buddy of mine runs that combo and he has had no problems except it is a little of a dog. Can it work, yes, but not ideal. Run that setup until you can regear and you will be fine.
Great to hear. I guess I'll start saving back for regear now.
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Old 01-07-2013, 03:06 PM   #12
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As one running your same engine & transmission with 35" tires and 4.88 gearing, go right to 5.13. Due to your transmission's overdrive ratio being so steep (.69) your RPMs will be a little too low with 4.88 and it will be frustrating with having to turn Overdrive off so often to get the RPMs up high enough so the engine isn't lugging.

After my previous TJ was stolen, I bought this one with 35" tires and 4.88 gearing/4-speed automatic and it's frustrating... the engine lugs too much. I'll regear to 5.13 when I win the lottery.
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Old 01-07-2013, 04:52 PM   #13
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Quote:
Originally Posted by Jerry Bransford View Post
As one running your same engine & transmission with 35" tires and 4.88 gearing, go right to 5.13. Due to your transmission's overdrive ratio being so steep (.69) your RPMs will be a little too low with 4.88 and it will be frustrating with having to turn Overdrive off so often to get the RPMs up high enough so the engine isn't lugging.

After my previous TJ was stolen, I bought this one with 35" tires and 4.88 gearing/4-speed automatic and it's frustrating... the engine lugs too much. I'll regear to 5.13 when I win the lottery.

Thanks Jerry. I was hoping you would have a suggestion about this. I'll regear to the 5.13 when I get the money saved back. Until then I'll just switch off the overdrive switch & make due.

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