2.4L I4, auto, 4.56 gears, 42rle. can it handle 31x10.5's? - JeepForum.com
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Unread 08-03-2010, 04:04 PM   #1
monkeygruven
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2.4L I4, auto, 4.56 gears, 42rle. can it handle 31x10.5's?

Would this be unbearable? I know I have the mythical "unicorn" jeep with stock 4.56 gears, but will this combination be totally unliveable? I do an even amount of city and highway driving, with about one wheeling daytrip a month.

Also, a related question. Which types of MTs are going to be the lightest? As in, which brand/line? I've heard Swampers are quite heavy, but I'm not sure about all the other brands. I'm trying to plan my build, which will be starting soon. Help!

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Unread 08-03-2010, 04:06 PM   #2
AFjeepMan
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that's a great setup! My friend has the '06 with the 4 cyl and 4.10's and he doesn't have a problem with it at all!
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WANTED: SYE and cv shaft...good condition and good price. for a TJ with about 5-6" of lift.
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Unread 08-03-2010, 04:07 PM   #3
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is he driving a manual?
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Originally posted by MotoSoul:

The real trail rated badges are located on your skid plates.
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Unread 08-03-2010, 04:14 PM   #4
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Quote:
Originally Posted by AFjeepMan View Post
that's a great setup! My friend has the '06 with the 4 cyl and 4.10's and he doesn't have a problem with it at all!
You're missing an important part of the equation....the 42rle. Far from being a great setup.

With that said, I wouldn't go bigger than 31's.
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Unread 08-03-2010, 04:20 PM   #5
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I have the 42rle and 3.73's and it's great, granted I have the 4.0, but the 42rle has a 3rd gear ratio of 1.0 which is the same as the final in the 5 speed or 5th in the 6 speed. So I'm not sure if you're pointing out that the tranny is the week link or the gearing won't work well, but I would think that 31's are no problem at all, and could possibly go a little bigger if wanted (up to 33's)
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WANTED: SYE and cv shaft...good condition and good price. for a TJ with about 5-6" of lift.
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Unread 08-03-2010, 04:47 PM   #6
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So are you saying that a 1:1 drive ratio in the tranny would be too tall at speed?i I know this setup would basically negate O/D, specially in the 42rle, which is something like 0.69:1, I believe.
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Originally posted by MotoSoul:

The real trail rated badges are located on your skid plates.
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Unread 08-03-2010, 04:51 PM   #7
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I use my overdrive plenty. I also don't abuse the skinny pedal. With a good tail wind you will have a good chance of using the OD haha. But seriously, most 31's are only slightly over 30" in overall diameter which is stock size on a TJ Sport. I don't think you'll have any problems at all, and you'll most likely use the OD about as much as you could expect with a 4 cyl.
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WANTED: SYE and cv shaft...good condition and good price. for a TJ with about 5-6" of lift.
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Unread 08-03-2010, 04:53 PM   #8
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My stock tires right now are the miniscule 215/75r15's, which works out to 27.7", but by now surely they're 27.0". The 2" radial increase going to 31's could be pretty significant, but I guess there's no way to really find out without throwing some on there?

Is the bolt pattern on a 2000 XJ 5on4.5 like TJ's? I have a friend with 30's, maybe I could throw those on just to check out how it feels. Hmm....
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Originally posted by MotoSoul:

The real trail rated badges are located on your skid plates.
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Unread 08-03-2010, 04:53 PM   #9
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Holy ****, if a 42RLE behind my 4.0 sucks, i can't imagine it behind a 4 banger. Go with 31s.
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Unread 08-03-2010, 05:01 PM   #10
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Why does everyone hate their 42RLE's? I know it's no off road beast, but it does a great job for me as a DD, and wheels plenty fine when I get a chance to go. Maybe I just don't wheel it hard enough or I got lucky!
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WANTED: SYE and cv shaft...good condition and good price. for a TJ with about 5-6" of lift.
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Unread 08-03-2010, 05:04 PM   #11
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Mines not bad either, there are just WAY better transmissions.
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Unread 08-03-2010, 05:06 PM   #12
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O I fully agree, but if it's not bad then you probably shouldn't go saying it sucks to a guy that's probably not gonna be looking to go extreme with it since for his purposes the 42rle is enough trans. no 4-banger is gonna be great with larger tires, but the 4.56's make it a lot more bearable with the 2.4
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[URL="http://www.jeepforum.com/forum/f22/my-05-tj-build-916271/"][SIZE="3"][COLOR="Red"]My Build Thread[/COLOR][/SIZE][/URL]

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(o)_) (o)_)--)_)

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Relearn your priorities.[/COLOR]

WANTED: SYE and cv shaft...good condition and good price. for a TJ with about 5-6" of lift.
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Unread 08-03-2010, 05:07 PM   #13
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I think it just has a tendency to shift too early, and the O/D ratio is just so steep, and kicks in so early, that it shifts out of the powerband. At least that's my understanding of it. This is the only Jeep I've owned, though, so I really don't have much to compare it to. I just don't want to throw a lot of cash into something that won't be bearable.
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Originally posted by MotoSoul:

The real trail rated badges are located on your skid plates.
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Unread 08-03-2010, 05:12 PM   #14
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it does do just that, and with the 4.0 it's manageable because even out of the "power band" it can still go in a straight line and maintain speed. You just may need to use the O/D shut off switch when not on the highway and shut it off. Then turn it back on when you hit 45-50...that could be one way of helping. If you're friend has XJ rims with 30's try those for a week or two and see how you like it. don't forget, you'll need a new speedo gear to get the right reading on the dash. So just keep the speedo at the speed limit or just a little under with the bigger tires until you do.
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[URL="http://www.jeepforum.com/forum/f22/my-05-tj-build-916271/"][SIZE="3"][COLOR="Red"]My Build Thread[/COLOR][/SIZE][/URL]

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Relearn your priorities.[/COLOR]

WANTED: SYE and cv shaft...good condition and good price. for a TJ with about 5-6" of lift.
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Unread 08-03-2010, 05:16 PM   #15
monkeygruven
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Ha, I'm not so sure he'd want to cruise around with his lift and all with some dinky 27's on it maybe for an afternoon though.
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Originally posted by MotoSoul:

The real trail rated badges are located on your skid plates.
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