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-   -   Larger Tires (http://www.wranglerforum.com/f274/larger-tires-84865.html)

Zeddjb 03-15-2011 09:42 PM

Larger Tires
 
Ok, I have been all over the internet looking for information on tires, regearing, lift kits, stock bumpers and the like.

I'm really wanting to get bigger tires and I was looking at 37's. More specifically, Wrangler MT/R with Kevlar

This will be the first time I have ever bought anything but stock tires for any vehicle and I'm quite concerned, excited, nervous; I don't want to screw it up. I'm going to be keeping my stock rims for the time being (will be upgrading those another time) but what I have been hearing is this:

37" tires will:
not fit with the stock rear bumper
require a regear
5.13
5.38
need reprogramming - superchips?


I have an automatic rubi with a 4" lift and wheel spacers.
There is so much controversy about the regearing (what is best/better/worse) and that right now is what is killing me the most.

However, this is my daily driver and I do plan on taking it across the country this summer and I want to make sure that I get everything done right.

If 37" tires won't work, what about 35" tires of the same brand? Is regearing a must?


I know this sounds like a mess and there is no direct question in this post, so I hope someone understands it.

:banghead:

JohnSmith 03-15-2011 09:46 PM

Hey man, I got 35s on with no lift and no regearing. I do have a flashpaq programmer that made a world of difference but I do not rock crawl my jeep. I do moderate off roading and it is my daily driver.
Now I am planning on lifting it soon and maybe regearing in the future, but since you have an auto too; I strongly urge you to get a programmer

Zeddjb 03-15-2011 09:54 PM

Is reprogramming something the dealer would be able to offer me? I don't want to have to buy something that I'm going to use once maybe twice that costs $300~
Superchips 3875 - Superchips® Flashpaq Programmer for 98-10 Jeep® Vehicles - Quadratec

MOPWR2U 03-15-2011 10:17 PM

Then get the AEV procal, it cost half as much.

If you drove mostly offroad, and the terrain was even a little bit technical, I would say regearing is not that important. Just put the t-case in low range when you go offroad, and you're good, even with the stock gear ratios in the axles. The few times you need to drive it on road you could just push the overdrive off button, and forget about using high gear. But if you're driving mostly on road, regearing makes more sense. Not being able to use high gear except on downhills and when you have a tailwind gets old in a hurry, especially if you're driving clear across the country.

I could also suggest a number of tires that are a better choice for on road and moderate offroad use than Goodyear MTR w/k tires, but I suppose that is a separate topic.

MTH 03-15-2011 10:31 PM

Sounds awesome. Now, about those questions . . .

You'll hate it without a regearing.

Most dealers won't reprogram above the largest stock size (32"). You'll want a superchip. If you don't get one, your speedometer and many onboard computer functions related to speed (such as shift points) will be all screwy.

Do you have a 2 door or a 4 door? If it's a 2 door, you almost surely need new driveshafts if you don't already have them. You might need them for a 4 door, though it's probably not as critical.

For 37s, there are other axle improvements you may want to consider, though it helps you have a Rubi.

A little general I know and I'm sure there's other stuff, but I've never been part of something that aggressive so I'm just relaying what I've heard. There are some folks on this forum who've done what you're looking to do and dine it really well. Hopefully they'll be able to chime in with specifics.

07XMan2Door 03-15-2011 11:08 PM

No tires will roll across the Country as well as the ones on your jeep right now. Chrysler pays their R&D engineers lots of money cause they know what they are doing. Your Jeep was built like a perfect jig saw puzz;e. Every piece mates up with all the others. Putting 37's on there w/o changing lots of other "pieces" will ruin the puzzle.

It will be miserable to drive if your go with 37's & not regear. Unless you are constantly going down hill with a tail wind. Then you will be able to go over 150 mph if you can keep it straight!!

This forum is chuck full of awesome information about running 37 inch tires. Many threads on this subject. Search & learn from those who are doing it with success. Check out what they have done & how much they have spent. Make certain you are prepared to do it all before you do any of it.
And please post B4 & aft pics.

Good luck!!

millfire517 03-15-2011 11:38 PM

Quote:

Originally Posted by MOPWR2U
Then get the AEV procal, it cost half as much.

If you drove mostly offroad, and the terrain was even a little bit technical, I would say regearing is not that important. Just put the t-case in low range when you go offroad, and you're good, even with the stock gear ratios in the axles. The few times you need to drive it on road you could just push the overdrive off button, and forget about using high gear. But if you're driving mostly on road, regearing makes more sense. Not being able to use high gear except on downhills and when you have a tailwind gets old in a hurry, especially if you're driving clear across the country.

I could also suggest a number of tires that are a better choice for on road and moderate offroad use than Goodyear MTR w/k tires, but I suppose that is a separate topic.

So far I am enjoying my Goodyear MTR's w/kevlar tires

richie894 03-16-2011 11:21 AM

With tires that large not only are you going to loose some power, but also prepare to take a drop in mpg's.

bamajeeper 03-16-2011 01:30 PM

Those 37 inchers cost like 700 each at Tire rack. You got a money tree growing in your backyard ?

JohnSmith 03-16-2011 04:22 PM

To each his own, it is his decision to purchase 37s.
On another note I would suggest driveshafts and regearing plus the superchips
Those are my two cents; good luck! I would love to see pics before and after
Btw, you might need rims, since alot of 37s are 37 by 13.5 and most shops won't put it on the stockers

Zeddjb 03-16-2011 06:52 PM

Quote:

Originally Posted by bamajeeper (Post 1120708)
Those 37 inchers cost like 700 each at Tire rack. You got a money tree growing in your backyard ?

That's crazy, because everywhere I'm looking they are in and around $300.00~

I don't have a money tree, but I do work for a living and I have been saving up for over a year. I get to at most do a mod a year, so I save up. This is the most expensive one and I want to get it right if I'm going to drop some money into it.

Zeddjb 03-16-2011 06:57 PM

Quote:

Originally Posted by JohnSmith (Post 1120999)
To each his own, it is his decision to purchase 37s.
On another note I would suggest driveshafts and regearing plus the superchips
Those are my two cents; good luck! I would love to see pics before and after
Btw, you might need rims, since alot of 37s are 37 by 13.5 and most shops won't put it on the stockers

Why new drive shafts? I'm not debating it, I just want to know more.

MTH 03-16-2011 07:34 PM

Quote:

Originally Posted by Zeddjb

Why new drive shafts? I'm not debating it, I just want to know more.

With a 2 door and a 4 inch lift, I think you'll probably want to move new driveshafts to the top of the to-do list--especially if you're planning a roadtrip. I think some folks with big lifts have avoided getting them, but the stock shafts will spit grease, need a lot of upkeep, and fail eventually.

Check out this article: (http://www.jpmagazine.com/techarticl...fts/index.html)

In fact, take a look at your undercarriage now. I bet you'll see the seals are leaking.

bamajeeper 03-16-2011 07:47 PM

Quote:

Originally Posted by Zeddjb (Post 1121255)
That's crazy, because everywhere I'm looking they are in and around $300.00~

I don't have a money tree, but I do work for a living and I have been saving up for over a year. I get to at most do a mod a year, so I save up. This is the most expensive one and I want to get it right if I'm going to drop some money into it.

My bad-- I was looking at the MT/R, not the MT/R with Kevlar. They only had one size MT/R 37/12.5/16.5 --for 702.00 .Sorry ,I hope you the best on your hard earned mods. It would seem that those made with Kevlar would cost more.I have a friend running the 35" MT/R kevlar and loves them.

ncossey 03-16-2011 07:53 PM

I just put some dick cepek mud country 35s on my 2dr and they are amazing. Very good road ride quality, excellent offroad traction, and no road whine even at 70mph, I have a softtop and I can actually use my phone again when im on the interstate.

JohnSmith 03-16-2011 08:19 PM

Quote:

Originally Posted by Zeddjb

Why new drive shafts? I'm not debating it, I just want to know more.

Well stock driveshafts are short and have rubber housing that can easily rip when it bumps the auto transmission. But with a 4 inch lift it is very easily destroyed. Depends on your off roading style, also suggest gussets for the front knuckles

David A 03-16-2011 08:49 PM

My 2 dr JK has a 5" lift I had to swap out the stock rear drive shaft with an after market shaft, plus had to replace the stock rear upper control arms with adjustable control arms to adjust the pinon angle on the rear axle. I also am running 37" tires I've had no problems with the mods and drive the JK every day. My Jeep is a 2007 X with a manual 6 speed trans. no regearing yet I plan to in the near future, I run at 60 mph in 5th gear at 1700 rpm. I'm happy with the 37" tires, but am going with 35" tires when the time comes for new tires.

Zeddjb 03-16-2011 09:50 PM

I probably should have said I have the 4 door JK, 2009. It's only a 4" lift now, but I wouldn't mind getting a 6" if I'm going with 37" tires; but that is another long while.

Any idea on cost of new drive shafts?

I don't really wheel that hard honestly. I'm going to the moab in a few months for the first time and probably won't hit any real hard trails; mainly because it's just me and my wife and one Jeep.

The most around where I live in WI, is just sand hills and mud and pretty flat trails; but I do go up north a couple times a year in the summer and winter to a friends ORV park. He has some decent obtecles setup and some 'tight & technical' trails that I like to mess with.

If I lived closer to some mountiness<<<is that a word?<< areas (out west) I would probably build the Jeep a lot differently.

I really do appreciate everyone's replies. I'm soaking it all up and learning as I go along. I'm probably going to hit up the dealer tomorrow, (i have a couple friends that work there) and see if I can't squeeze some more info out of them.

stanger04 03-16-2011 09:58 PM

Okay the bumper isn't an issue you can get hoop bumpers if needed aka bumperettes (how ever you spell it). I have a 95 with a 1" body lift and 31's I have 2" of space give or take. To get a 37 is gonna be a big deal, do you have an issue with say a 32 or 33. You can do a budget lift, ride will be more "Jeep" like but is cheap.

I would say look to a mid-range lift kit and 35's max. If you just want a crazy tall tire then you need a crazy lift and ride will change. I have a cousin with 44's under a CJ it looks great but rides like crap on the road, that's why he rarely drives it on the hwy.

If this is a driver you need to really relate the wants and needs to the abilities of the pocket book. I give you props if you can afford it I can't, wish I could, not crushing a dream we all have them but want you to get the best you can and be happy.

37's on a daily driver at least 3K done right, give or take a little.

07XMan2Door 03-16-2011 10:01 PM

Quote:

Originally Posted by David A (Post 1121482)
My 2 dr JK has a 5" lift I had to swap out the stock rear drive shaft with an after market shaft, plus had to replace the stock rear upper control arms with adjustable control arms to adjust the pinon angle on the rear axle. I also am running 37" tires I've had no problems with the mods and drive the JK every day. My Jeep is a 2007 X with a manual 6 speed trans. no regearing yet I plan to in the near future, I run at 60 mph in 5th gear at 1700 rpm. I'm happy with the 37" tires, but am going with 35" tires when the time comes for new tires.

Great testimony right there^^^

topher38 03-16-2011 10:02 PM

Quote:

Originally Posted by Zeddjb (Post 1119586)
Ok, I have been all over the internet looking for information on tires, regearing, lift kits, stock bumpers and the like.

I'm really wanting to get bigger tires and I was looking at 37's. More specifically, Wrangler MT/R with Kevlar

This will be the first time I have ever bought anything but stock tires for any vehicle and I'm quite concerned, excited, nervous; I don't want to screw it up. I'm going to be keeping my stock rims for the time being (will be upgrading those another time) but what I have been hearing is this:

37" tires will:
not fit with the stock rear bumper
require a regear
5.13
5.38
need reprogramming - superchips?


I have an automatic rubi with a 4" lift and wheel spacers.
There is so much controversy about the regearing (what is best/better/worse) and that right now is what is killing me the most.

However, this is my daily driver and I do plan on taking it across the country this summer and I want to make sure that I get everything done right.

If 37" tires won't work, what about 35" tires of the same brand? Is regearing a must?


I know this sounds like a mess and there is no direct question in this post, so I hope someone understands it.
:banghead:


I am running the wrangler mt/r with kevlar 33" on my jeep if your a daily driver on the road DO NOT BUY. yes they are a great comfertable tire i can tell you that they are great for mud, dirt and anything off road. iv had mine for a year and they are about as worn down as they should be at year 2. dont buy if your not using them for mainly off roading :nonono::nonono::nonono:

MOPWR2U 03-16-2011 10:24 PM

Quote:

Originally Posted by Zeddjb (Post 1121610)
I probably should have said I have the 4 door JK, 2009. It's only a 4" lift now, but I wouldn't mind getting a 6" if I'm going with 37" tires; but that is another long while.

Why do you want so much lift? Is it primarily for looks? Just wondering, because it complicates everything, and you can run 37s with a 2 1/2" lift if you change to flat fenders.
Quote:

Originally Posted by Zeddjb (Post 1121610)
Any idea on cost of new drive shafts?

About $450 each, give or take.
Quote:

Originally Posted by Zeddjb (Post 1121610)
I don't really wheel that hard honestly. I'm going to the moab in a few months for the first time and probably won't hit any real hard trails; mainly because it's just me and my wife and one Jeep.

Have fun in Moab, its great. May I suggest Poison Spyder Mesa as a good beginner trail. It has some challenges, and taking some optional lines can increase those challenges, but all of the tough spots can be bypassed if you want. Scenery is spectacular.
Quote:

Originally Posted by Zeddjb (Post 1121610)
I really do appreciate everyone's replies. I'm soaking it all up and learning as I go along. I'm probably going to hit up the dealer tomorrow, (i have a couple friends that work there) and see if I can't squeeze some more info out of them.

Hate to say this, but a dealership is probably the worst place you can go to get advise on modifying a Jeep.

Zeddjb 03-17-2011 05:16 PM

Thanks for the great info MOPWR2U. I'm going to tackle your responses in order:

6" lift was not just for looks (although I'm sure it would look bad-ass), I wasn't sure if the 37" tires would flex enough with just a 4". I read some other posts on other fourms that people having issues with said setup and couldn't flex alot.


$450.00 each on the new drive shafts? :facepalm: that is going to hurt me then. that's another $1k~. Is this something that I must do right away or can it wait maybe a half a year to a year?


I will definitely check out that trail. I think we'll have a great time out there; even if we don't hit any hard trails, like you said the scenery I hear is beautiful.


I agree with you on the dealership. Thing is, I don't know anyone else or don't have any 4x4 shops/clubs/friends that I can go to other than the internet forums.


Quote:

Originally Posted by topher38 (Post 1121669)
I am running the wrangler mt/r with kevlar 33" on my jeep if your a daily driver on the road DO NOT BUY. yes they are a great comfertable tire i can tell you that they are great for mud, dirt and anything off road. iv had mine for a year and they are about as worn down as they should be at year 2. dont buy if your not using them for mainly off roading :nonono::nonono::nonono:

The Jeep is my daily driver, but I don't go far to work and when we do go for a long trip, we usually just take the truck and leave the Jeep home.

That being said, we are driving the Jeep to Moab this time around and if the tires will work for the interstate that far, that would be great. If not, anyone suggest a better tire? Keep in mind that I do alot of mudding and deep sand trails around my area.

07XMan2Door 03-17-2011 05:52 PM

Stock rime & tires don't fetch a premium, so you could consider keeping them for road trips that don't involve heavy wheeling.

JPWheelin 03-17-2011 06:34 PM

If you have some friends at a dealer, perhaps you could ask them to take a look at the driveshaft angle and see if it will be a problem.

Just my $.02, but if there is a chance there will be a problem I would do the driveshafts before I did the tires (if you only want to drop the cash on one or the other). No point in having big new tires that don't spin :).

topher38 03-17-2011 10:47 PM

[/QUOTE]
The Jeep is my daily driver, but I don't go far to work and when we do go for a long trip, we usually just take the truck and leave the Jeep home.

That being said, we are driving the Jeep to Moab this time around and if the tires will work for the interstate that far, that would be great. If not, anyone suggest a better tire? Keep in mind that I do alot of mudding and deep sand trails around my area.[/QUOTE]

like i said for off road stuff they are more than amazing. im not sure about sand i dont have here in colorado. and yes they are amazing on paved roads. very smooth and comfertable they just seem to wear down very quick but that could be my driving.

im glad that i have bought them but i since im only off road 1% of the time i will more than likely not go back to these tires.

oh and have a hell of a time in moab im trying to get some money saved for next spring or summer

mikedcan 02-05-2013 01:53 PM

Is there a Superchip for a 2011 JKU Sahara? The only ones I am finding are for 2010 or older


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