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Old 11-23-2010, 02:23 PM
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Regearing Needed?

Looking to put on 33's but not sure if I need to regear. I have a 2003 TJ SE 4 cyl, with the stock axles. I have the lift and everything taken care of, I'm just wondering if I need to upgrade my stock 4.10's. I'm currently running 31's and they're doing just fine, but want to go to 33's

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Old 11-24-2010, 01:41 PM
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Bumping this, just want to get a couple opinions if the TJ will be too sluggish with the current gear setup

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Old 11-24-2010, 01:48 PM   #3
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It will be more sluggish than it is now, but only you can decide if it's too sluggish. Try them, if you hate them, go back to 31's or regear.
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Old 11-29-2010, 04:07 PM   #4
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With a 4cyl would probably need atleast 4.56 for gears.... Are you sure that you currently have 4.10s as your stock gearing??? you should be OK, but the 4cyl will be sluggish

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Old 11-30-2010, 07:24 PM   #5
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What about a Tera Low kit on the T Case.
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Old 11-30-2010, 07:50 PM
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Upon further inspection (actually going underneath the jeep) it appears that I actually have 3.73's and running 31" tires. Knowing that, I can't possibly run 3.73's with 33's. However, my current set up is fine in terms of acceleration and highway driving. That being said, if I bump up from 3.73's to 4.10's while going from 31" to 33" will they basically equal out and be the same? Thanks for the help.
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Old 11-30-2010, 09:33 PM   #7
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I'm no expert at all but that sounds logically correct. Even with 4.10's, it will still be more sluggish than it would be with 4.56's but I wouldn't worry about it. You're not a race car
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Old 11-30-2010, 10:09 PM
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Yeah I think that sounds correct too. I eventually want to go up to 4.56's but I think that is going to be much more expensive that going up to 4.10's for the time being. And we are certainly not race cars
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Old 12-01-2010, 12:23 AM   #9
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just out of curiosity, why do you think it will be much more expensive to go with 4.56s over 4.10s
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Old 12-01-2010, 08:56 AM
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just out of curiosity, why do you think it will be much more expensive to go with 4.56s over 4.10s
Well firstly, my D35c probably can't handle 33" tires with 4.56's for very long so I figured that an upgrade to a d44 would be necessary. And I'm assuming that a 4.10 geared d44 would be easier to find than a 4.56 geared d44, is that not right? I'm pretty new to the whole drivetrain thing.
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Old 12-01-2010, 11:22 AM   #11
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Quote:
Originally Posted by jml7388 View Post
Well firstly, my D35c probably can't handle 33" tires with 4.56's for very long so I figured that an upgrade to a d44 would be necessary. And I'm assuming that a 4.10 geared d44 would be easier to find than a 4.56 geared d44, is that not right? I'm pretty new to the whole drivetrain thing.
generally speaking a D35 is gona be a ticking time bomb when it comes to 33s. if you are looking for a D44 out of a tj, then the only way you will find 4.10 gears are if it was out of a rubicon. otherwise it will have 3.73s IIRC assuming the axle is still stock. cause if you change you rear axle gears, then you need to change the fronts as well. and in the end, it would come out cheaper to only have to re gear once. if you find a rear D44 with 4.10s, and put that in, you would then have to re gear the front to match, only to latter re gear both axles to 4.56 down the road.
it would be much better to just do it right the first time, save up and go with a ford 8.8 or D44 geared to what you want in the end. either the 4.56s or maybe even 4.88s depending on how ya wheel, etc.
either wait to get the 33s till you can get the rear axle and front gears you want, or put 33s on it now, deal with it being a little sluggish, and just carry some spare shafts with you incase you break the D35.
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Old 12-01-2010, 12:09 PM
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saving up would probably be the best option then. Out of curiosity, if I keep my TJ on the street most of the time or until I can save up for a d44 properly geared, will I have to worry about breaking the d35 with 33's if I hold off on wheeling it?
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Old 12-01-2010, 12:20 PM   #13
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you should be able to get by just fine. in theory, you could get away with some light wheeling as well, there are several people on the forum who do. most of them just carry spare axle shafts so that if they do snap a shaft, they can fix it and continue on.

do you have the 2.5 or the 2.4 4 cylinder motor?
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Old 12-01-2010, 12:40 PM
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I have the 2.5 4 cylinder motor. The previous owner did the lift and put on the 31's so I unfortunately don't know as much as I would like. I suspect they didn't fix the speedo from what I can feel on the road. Also, I'm pretty sure they didn't regear it, but is there a test to tell by comparing my rpms at a certain speed? Would this calculator be useful?

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Old 12-01-2010, 12:44 PM
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answered part of my own question, with 31's at 65mph rpms will be 2630 with 3.73's and 2890 with 4.10's
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Old 12-01-2010, 12:48 PM   #16
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gearing up generally isnt worth it on 31s. the cost benefit ratio just isnt really there.
as far as that tire size calculator, it might be useful, but who knows. as it is from a toyota tacoma forum, there is always the off chance it was programed with that truck in mind.
and with the 2.5 and 33 inch tires, 4.88s might be the better gears. it seems that is the closest to stock feeling as you can get.
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Old 12-01-2010, 07:17 PM   #17
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Maybe a Ford Sport Trac axle with 4.88 gears ?
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Old 12-02-2010, 10:10 AM   #18
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Hmmm interesting....
A D35 and 33's will be OK, there's plenty of people running that combination and willing to bet half the people on this board are already set-up that way.

The ticking time bomb, is when running D35 and 35's for tires. You can run them, but eventually the D35 and 35's won't agree... lol

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Old 03-03-2011, 07:36 PM   #19
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I have a 4.0 tj with 3.07 and 33s way to high gears what would be my best ratio to change to it is not a daily driver but I do take some trips in it from time to time
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Old 03-04-2011, 07:48 AM   #20
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I have a 4.0 tj with 3.07 and 33s way to high gears what would be my best ratio to change to it is not a daily driver but I do take some trips in it from time to time
I had a 06 Tj 4.0 6speed trans running that same set up. I then changed the gears to 4:56. With locker in the rear worked great did alot of off roading and some extreme trails without problems but like everyone have said you run the risk of breaking axles
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Old 03-06-2011, 10:04 AM   #21
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This is a much debated topic. 4:56 or 4;88's would work best. Cheaper to re-gear only once, lots of labor. I have a Dana 44 for sale with 4.88's if your interested.
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Old 03-06-2011, 10:06 AM   #22
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Hmmm interesting....
A D35 and 33's will be OK, there's plenty of people running that combination and willing to bet half the people on this board are already set-up that way.

The ticking time bomb, is when running D35 and 35's for tires. You can run them, but eventually the D35 and 35's won't agree... lol

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you right, but a D35 is a ticking time bomb in a jeep on the street on 33's.
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Old 03-06-2011, 10:42 AM   #23
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Wish I had a nickel for every post on this forum about how bad the D35 is.

33's on a D35 causes the earth to stop turning. The skies will open up and it will rain 27 spline axel shafts from the sky.

Please for the sake of all mankind don’t do it.

Of course I ran 33's on a stock D35 w/ 3.07 gears on my TJ for some time before I upgraded. I wanted a locker inthe rear and knew that would be too much. I upgraded to the Super 35 kit from Superior Axel. 30 spline shafts. Perfect for a TJ on 33's.

Agelesstranger has a great build thread about his 8.8 install. Please check it out.
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Old 03-06-2011, 11:03 AM   #24
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only read half of this cause I lost patience but, waste of time to go just to 4.10s from 3.73s. 35s can handle whatever up to like 35s. your rear axle should be d44 for 33s if you offroad HARD. no problem running 33s with 3.73s if your only on road, even some trails. if you dont want to regear and feel like dropping all the cash, then go to 4.56. I have 3.07s and plan on running 33s, Im not worried
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Old 03-06-2011, 09:11 PM   #25
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I have 33s with 3.07 6 speed manual 6th gear is a waste unless you are going 80 on flat ground with no wind I was just wondering if I would be happy with 4.10 or should I go lower?
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Old 03-08-2011, 10:13 AM   #26
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I put 4.88s in mine so I could get above 60 on the highway.
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Old 03-08-2011, 11:54 AM   #27
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I put 4.88s in mine so I could get above 60 on the highway.
Do you have the same setup 33s with 3.07 6 speed. If so what are your rpms in 6th at 65.
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Old 03-08-2011, 02:33 PM   #28
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I put 4.88s in mine so I could get above 60 on the highway.
I meant same setup minus the 3.07

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