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Topic Review (Newest First)
12-17-2012 09:53 PM
Yella
Quote:
Originally Posted by PieFace View Post
I love seeing threads brought back from the dead. I started this one, and I still dont have the 35s. WTF?
So let's bring it back up again.

Quote:
Originally Posted by VASYLfromUKRAINE View Post
wake up post
YELLA DID YOU RE GEAR YOUR RIG?WHAT GEAR DO YOU CHOOSE?
hi5
I have an appointment December 26 for a regear operation front and back. Going with 4.88. Since I need to replace the front carrier and spiders for compatible reasons I am getting a Detroit (Eaton) Tru Trac instead. It is basically half price by eliminating the carrier and spiders. A 3875 Superchips programmer is also going to be installed. I have about 67000 miles on it now so I am going with a master overhaul kit front and back. By the way, the gearing is Yukon. 12 month or 12000 warranty.

PieFace, did you ever get those 35's?

Beastmaster, what did you ever do about gearing?

Chime in fellas, I'm interested in what you think of this setup I'm planning to get.
09-25-2012 06:54 AM
C1ph3r Thanks a lot guys. I appreciate the responses. Yes it is very agonizing. I do not see me ever going back down in tire size. My other thought pushing me towards the 5.13s is indeed tire size but the other direction. I don't ever see myself going to 37s but these Duratracs don't measure real close to 35 so if I ever get true 35s or close then I will be better served by the smaller gears I think.

Thanks again.
09-25-2012 06:26 AM
kbwwolf
Quote:
Originally Posted by C1ph3r View Post
I have just finished this entire thread. Thank you for a wealth of information. I know it started for a 12 but I have one more question about this for my 08 Auto. JKU Sahara I have not yet done the gear calculator but I will. I was recommended to go with 4.88s from someone in the Jeep community that I hold a lot of respect for. I have 315/70r17 Duratracs. However, I drive in the mountains a few times a year and I want to do some light towing. Right now, this thing is a dog on the interstate. 1st thing I do when I start the Jeep is turn off overdrive. This weekend on the way to and home from the mountains, I was finding that the Jeep would have to down shift into 2nd to maintain speed on long hills. So after reading this thread I have now think I should go to 5.13. I have read somewhere that the 5.13s in a d30 have really small teeth and are weak. Is this something to be concerned about?
You gotta understand, a lot of this is subjective, based on factors such as your personal driving style, where you live (NC, I know), how you use your Jeep, etc.

I know that's a caveat, and you'd prefer a definitive answer, but in most cases its something best worked out through long, agonizing research, discussions with the shop that's gonna do your gear change, coin flips, dream interpretation, etc. Yeah, it sucks. But its a big expense, and you only wanna do it once, so its necessary suckage.

From all that I've read, I think it would be a mistake to go with anything less than 5.13 gears on a Jeep with your current equipment and needs: 3.8L engine, automatic trans, 35" tires, towing. Throw mountains in there, albeit occasionally (same as me), and I would STRONGLY recommend the 5.13's. To my mind, it's the auto trans that swings it; if you had a manual, I'd say 4.88's would be fine, even with the towing.

I don't know about weak teeth in the D30; I have yet to see a thread where that's been a problem for someone who regeared their Jeep. Doesn't mean it isn't so...only that I haven't run across it.

I'd suggest you use the gear calculator to give you some input...the goal of regearing (in my mind, anyway) is to get your rpms at or near 2500 @ 70 mph in high gear. A little higher or lower won't hurt anything, though I'd rather be at or above.

All in all, sounds to me like you're on top of it. Now you just gotta dig up enough empirical evidence to convince yourself which way to go. Part of that whole research suckage thing I mentioned above.

One last thing: you'll notice a marked improvement even if you decide to go with the 4.88 gears. But I think you'll be happier with the 5.13's...unless you suddenly decide to downsize your tires to 33's, in which case you'll wish you got the 4.88's. See how it works?

Good luck.
09-25-2012 05:55 AM
fftaco I live in the foothills of the mountains and I put 4.88s in a 2010 with 35's and it is a automatic trans. It is a sport same thing as the Sierra. With a 30 front axle. RPM's is around 2300 at 70. It does great going up and down the mountains it only comes out of overdrive. Personally I think you would need only 4.88s
09-24-2012 03:04 PM
C1ph3r
Quote:
Originally Posted by kbwwolf View Post
This thread kinda broke into two parts: the first page was dealing with Pieface's q's regarding his '12; page 2 was concerned with the 3.8L Jeeps.

Your '09 is severely undergeared from the factory. With the 4.10's, it may not be worth it to you to regear for 33" tires (though it would be to me). For 35's, if you don't regear, kids on skateboards will smoke you.

Where you aim for, gear-wise, depends on whether you've got an auto or a manual. With a manual you can get away with 4.88 gears. Auto, I'd go 5.13.
I have just finished this entire thread. Thank you for a wealth of information. I know it started for a 12 but I have one more question about this for my 08 Auto. JKU Sahara I have not yet done the gear calculator but I will. I was recommended to go with 4.88s from someone in the Jeep community that I hold a lot of respect for. I have 315/70r17 Duratracs. However, I drive in the mountains a few times a year and I want to do some light towing. Right now, this thing is a dog on the interstate. 1st thing I do when I start the Jeep is turn off overdrive. This weekend on the way to and home from the mountains, I was finding that the Jeep would have to down shift into 2nd to maintain speed on long hills. So after reading this thread I have now think I should go to 5.13. I have read somewhere that the 5.13s in a d30 have really small teeth and are weak. Is this something to be concerned about?
09-03-2012 04:30 PM
kbwwolf
Quote:
Originally Posted by Hawaii 5-0 View Post
I have an 09 auto w/ 4.10s. From what I've been reading here I should be OK with 33s or even 35s? I have 32s now.
This thread kinda broke into two parts: the first page was dealing with Pieface's q's regarding his '12; page 2 was concerned with the 3.8L Jeeps.

Your '09 is severely undergeared from the factory. With the 4.10's, it may not be worth it to you to regear for 33" tires (though it would be to me). For 35's, if you don't regear, kids on skateboards will smoke you.

Where you aim for, gear-wise, depends on whether you've got an auto or a manual. With a manual you can get away with 4.88 gears. Auto, I'd go 5.13.
09-03-2012 02:06 PM
Hawaii 5-0
Quote:
Originally Posted by PieFace View Post
Welcome to the forum.

Here is all the information you need on this topic. Get the 4.10s. dont consider the 3.73s if you plan to go to 35s. The 4.10s are excellent with the larger tires and with the auto even more so.

You will not need to regear if you get the auto with 4.10s. Once you put the wheels on you will see what I mean. You at most might want to get an aev procal and alter where your auto shifts. maybe.
I have an 09 auto w/ 4.10s. From what I've been reading here I should be OK with 33s or even 35s? I have 32s now.
08-19-2012 06:19 PM
fftaco I have just have removed the 3.73 and put 4.88s in my jeep. I live in the foot hills of NC and the auto trans was shifting all the time, down the hwy and back roads, now it don't down the shift half as much and has more power also i get better mpgs was 15 to16 now17 to 18. O ya still have the stock tire size for now
08-19-2012 05:24 PM
Ancientpath Jesus motor I gotta laugh every time I read that....................
08-19-2012 09:28 AM
tomgillotti This thread is great! I've just spent the past two days reading though it (not all at once... I'm not that slow) and it's helped quite a bit in my quest to be more knowledgeable on this whole re-gearing thing. I am still curious how a custom tune would do on this vehicle. Anyone have any experience there? Did it help out power and fuel economy or just power? Or, neither?
08-18-2012 09:48 PM
pluke the 2 we had 37s on 373s minvan motor for a year with an automatic it wasnt bad...

we currently have a 2012 automatic with 4.10s and 37s and don't have a need to regear till we jump to 40s.
08-18-2012 09:28 PM
genesbro
Quote:
Originally Posted by PieFace View Post
hey everyone,

Im looking to go to 35s, and i have 12 with 4.10 gears and a 6 speed.

Id never been offroad until last weekend, and I will tell you, I love my truck. It is unstoppable, and im sure i didnt scratch the surface of its capability.

I put it in 1st gear in 4 lo with my axels locked and the sway bar disconnected, and the thing would climb anything i pointed it at i didnt even have to touch the gas pedal. Once i realized my trying to drive the truck was the problem and just put in first and stopped touching the pedals it truely amazed me.

My favorite part was crawling down rocks without using the brakes.

Here's the question, My wheels are stock now. If i go to 35s without a regear, will it perform the same off road? or will the larger tires make 1st gear in 4 lo roll faster losing the crawl that i loved so much? or will it not be a noticeable difference.

Im planning to go to duratracs wich are a smaller 35. Guys with rubi's who went to 35s before a regear and took it krawling please let me know your views.
With the 6 speed and the 4.10s there is no reason to regear for 35s. It will perform pretty well on street and will do great offroad.
08-18-2012 09:08 PM
3JKs1H1 It'll be fine offroad with 35's and 4.10.

In low, your rubicon has a 4:1 transfer case. The other JK's are 2.73:1 You have a lot more gear than they do. With 35's it will still crawl up and down slowly. The pentastar will do fine on the freeway pushing a 34/35 and 4.10's although you'll be pushing 2800 rpm, so it will use some gas.

No need to regear.
08-18-2012 08:07 PM
PieFace
Quote:
Originally Posted by JKURz Wild View Post
new member, 1st post

just read through all this and it's great info

I don't own a Jeep yet - on the fence between 2 new 2012 JKUR autos: 1 with 3.73 and the other with 4.10 - hopefully soon.

would want to go to 35s at some point, don't want to spend $ to regear - so this thread has been really good

The diff / tire size charts have been informative and I have been staring at this graph too -- http://image.fourwheeler.com/f/33718...dyno_graph.jpg

which is from this article -- First Drive: 2012 Jeep Wrangler 3.6 - Four Wheeler Magazine
Welcome to the forum.

Here is all the information you need on this topic. Get the 4.10s. dont consider the 3.73s if you plan to go to 35s. The 4.10s are excellent with the larger tires and with the auto even more so.

You will not need to regear if you get the auto with 4.10s. Once you put the wheels on you will see what I mean. You at most might want to get an aev procal and alter where your auto shifts. maybe.
08-18-2012 06:25 PM
JKURz Wild
new member, 1st post

new member, 1st post

just read through all this and it's great info

I don't own a Jeep yet - on the fence between 2 new 2012 JKUR autos: 1 with 3.73 and the other with 4.10 - hopefully soon.

would want to go to 35s at some point, don't want to spend $ to regear - so this thread has been really good

The diff / tire size charts have been informative and I have been staring at this graph too -- http://image.fourwheeler.com/f/33718...dyno_graph.jpg

which is from this article -- First Drive: 2012 Jeep Wrangler 3.6 - Four Wheeler Magazine
07-03-2012 07:09 PM
PieFace
Quote:
Originally Posted by VASYLfromUKRAINE View Post
why???
wtf???
WTF - means why the hell dont I have 35s yet. LOL
07-03-2012 06:25 PM
kjeeper10 ..
07-03-2012 06:14 PM
VASYLfromUKRAINE
Quote:
Originally Posted by PieFace
I love seeing threads brought back from the dead. I started this one, and I still dont have the 35s. WTF?
why???
wtf???
07-03-2012 05:27 PM
PieFace I love seeing threads brought back from the dead. I started this one, and I still dont have the 35s. WTF?
07-03-2012 04:47 PM
VASYLfromUKRAINE wake up post
YELLA DID YOU RE GEAR YOUR RIG?WHAT GEAR DO YOU CHOOSE?
hi5
04-05-2012 08:33 AM
JIMBOX Sorry Yella, I was doing other stuff and I mis-wordrd that statement--


Quote:
Originally Posted by Yella View Post


Wow Jimbo. This means I'm gonna have to open up a whole new dimension of my brain whenever I read your post; mind reading.
I used "Bad Idea" and it shouldn't have been alone--I meant "Bad Idea" for my repeat of the post. Regearing to 5.38s, was the beat idea I had for my jeep, but

We've hijacked this thread---it's supposed to be about 2012 jeeps !

JIMBO
04-04-2012 11:24 PM
Probo
Quote:
Originally Posted by chris.george

Geez, may as well go with the EVO coil over and throw in a Hemi
I wish... Hemi will be once I get 300000 km. on the engine instead of buying a new vehicle...
04-04-2012 11:20 PM
kbwwolf
Quote:
Originally Posted by Yella View Post
You have the Jesus motor. You should drive my '08 around sometime. Then you would be hip.


I have the Jesus motor, too. 3.73 w/35's, and I'm hurting in sixth. Not terribly, but still gonna regear this summer.

Different strokes.
04-04-2012 11:15 PM
Yella
Quote:
Originally Posted by JK NotLimited View Post
I honestly don't get what all this talk about re-gearing is about.
You have the Jesus motor. You should drive my '08 around sometime. Then you would be hip.
04-04-2012 11:11 PM
Yella
Quote:
Originally Posted by JIMBOX View Post
I was in Fallon, Nv for some duties and while glancing thru the forum on my laptop--

I read the last posts on this thread and I wrote many points on the regear-

Then a light went off in my memory-so I reread it and I'd already answered the 5.38 question, so I said "bad idea" ----mine, I don't like repeating, unless it's a 1911 !

--JIMBO


Wow Jimbo. This means I'm gonna have to open up a whole new dimension of my brain whenever I read your post; mind reading.
04-04-2012 10:19 PM
JK NotLimited
Quote:
Originally Posted by PieFace View Post
hey everyone,

Im looking to go to 35s, and i have 12 with 4.10 gears and a 6 speed.

Id never been offroad until last weekend, and I will tell you, I love my truck. It is unstoppable, and im sure i didnt scratch the surface of its capability.

I put it in 1st gear in 4 lo with my axels locked and the sway bar disconnected, and the thing would climb anything i pointed it at i didnt even have to touch the gas pedal. Once i realized my trying to drive the truck was the problem and just put in first and stopped touching the pedals it truely amazed me.

My favorite part was crawling down rocks without using the brakes.

Here's the question, My wheels are stock now. If i go to 35s without a regear, will it perform the same off road? or will the larger tires make 1st gear in 4 lo roll faster losing the crawl that i loved so much? or will it not be a noticeable difference.

Im planning to go to duratracs wich are a smaller 35. Guys with rubi's who went to 35s before a regear and took it krawling please let me know your views.
I honestly don't get what all this talk about re-gearing is about. I have a '12 with 3.21 and 35s and i'm very impressed, actually i let a guy from Jeep dealer drive it Today 'coz he was curious how the 2.5" lift and heavy tires and bumpers changed the ride and he said the same as me-not at all or very little. This is from a guy that drives JKs daily. I was thinking about re-gearing before i put the 35s on because of all this re-gearing talk and honestly, i'd rather throw the money away since i can't imagine the thing to drive better. I own a Charger SRT8 and used to own BMW 750 (which i traded for the Jeep with some cash to spare that went to mods) so i know a thing or two about power and the '12 JK does not lack it, which very pleasantly surprised me.
Save your cash people and buy something that's worth it
04-04-2012 10:06 PM
chris.george
Quote:
Originally Posted by Probo

Ya once u start it never stops... I went from happy with 33s... To 4.5 inch lift and 35s... Thinking beefing axle now I'm thinking new 6.5 inch lift and 38s and Dana 60 front and rear haha... Now only I could find 15000 somewhere laying in the st I could do it.... Guessing it will be a 2 year maybe 3 year process ... There's a couple of guys in here that are very experienced and knowledgable... It's pretty obvious who they are... I just read all there posts and I found that to be the best way to get the information u need on almost every topic... And there sarcasm from some of them is hilarious... Woke the old lady up a couple of times laughing out loud at 1 am in bed... Good luck with the modd
Geez, may as well go with the EVO coil over and throw in a Hemi
04-04-2012 09:15 PM
Probo
Quote:
Originally Posted by Beastmaster

Ya, I plan on crunching the numbers this weekend.
I have a manual trans BTW.

I still have mixed feelings about going larger on the tires, and the re-gear numbers will (hopefully) help me decide. My rig runs like a champ with 33s and now I know I have 4.10 gears, that explains it so I'm happy with what I have. Several pros and cons to 33s vs 35s.
If I go the 35" route, I'll do it right. I'll calculate the gears, beef up the axles like Probo suggests, add armor, etc. etc. I know I'm talking big $$ so I'm taking my time.

Ya once u start it never stops... I went from happy with 33s... To 4.5 inch lift and 35s... Thinking beefing axle now I'm thinking new 6.5 inch lift and 38s and Dana 60 front and rear haha... Now only I could find 15000 somewhere laying in the st I could do it.... Guessing it will be a 2 year maybe 3 year process ... There's a couple of guys in here that are very experienced and knowledgable... It's pretty obvious who they are... I just read all there posts and I found that to be the best way to get the information u need on almost every topic... And there sarcasm from some of them is hilarious... Woke the old lady up a couple of times laughing out loud at 1 am in bed... Good luck with the modd
04-04-2012 01:44 PM
Beastmaster
Quote:
Originally Posted by Yella View Post
Beastmaster, get into that regearing calculator so that as you drive you can realize just what the numbers mean. Once kbw hipped me to it I was froze looking at it for several hours over the next few days. I spent the first hour just trying to figure out how to work it. I never did figure out if you have a manual or auto. Mine is manual. Since I figured out what the calculator was all about I can very easily imagine just how my jeep will drive with 4.88s. I can imagine how even in first gear I could benefit with regearing. I might expect first gear will have limited use after I regear. But that is going ot be great for off-roading. Right now my 5th and 6th gears have no use. My jeep hasn't seen those gears in a few weeks now. At first I thought I might have lost a little mpg. After a couple of weeks getting used to the 4-gear limit I imposed on myself and taking it easy on the new found power I found my gas mileage went back to normal. I suspect my mpg might actually improve after a regearing.

So get on that calculator and play around with it. There are two on the same page so you can compare different tires or gears. Just don't forget what wolf said about recalculate every time you change something.
Ya, I plan on crunching the numbers this weekend.
I have a manual trans BTW.

I still have mixed feelings about going larger on the tires, and the re-gear numbers will (hopefully) help me decide. My rig runs like a champ with 33s and now I know I have 4.10 gears, that explains it so I'm happy with what I have. Several pros and cons to 33s vs 35s.
If I go the 35" route, I'll do it right. I'll calculate the gears, beef up the axles like Probo suggests, add armor, etc. etc. I know I'm talking big $$ so I'm taking my time.

04-04-2012 08:52 AM
JIMBOX I was in Fallon, Nv for some duties and while glancing thru the forum on my laptop--

I read the last posts on this thread and I wrote many points on the regear-

Then a light went off in my memory-so I reread it and I'd already answered the 5.38 question, so I said "bad idea" ----mine, I don't like repeating, unless it's a 1911 !

--JIMBO
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