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Old 06-21-2011, 08:36 PM   #1
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What Size Tires Can A 2.5L Pull Safely

I Have A 98 SE Wrangler, And I Want Big Tires. What Size Can I Get That Safe On My Tranny And I Plan On Getting A 4" Lift By Skyjacker, So 33's Would Be The Biggest. But For Common Knowledge I Would Like To Know. Sorry If This Is Random And I Don't Seem To Know Anything .

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Old 06-21-2011, 08:55 PM   #2
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I didnt know much eithr till I started asking questions and getting on the jeep sites, funny that it works that way, I have a 4 cyl with 33 x 12.5 tires,it's a dog on the highway,and wants to wander around on the road. But on the trails it's great,can go anywhere anybody else can. I plan on downsizeing to 31 x 10.5 tires for the highway,and keeping my big tires for wheeling on the weekends,or maybe even a narrower 31 inch tire. Have to do some research on that.

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Old 06-21-2011, 09:01 PM   #3
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For a four banger with a manual tranny I would say 35's would be about the biggest. Reason being that you can only regear up to 4.88.
You can run bigger but then you are going to be getting into a lot more money then just regearing.
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Old 06-21-2011, 09:09 PM   #4
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Ok Thank You I Was Thinking 31x10.50 But I Have A Auto Tranny Do You Think That Would Be Fine Too ? I Want Boggers Too
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Old 06-21-2011, 09:22 PM   #5
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Ok Thank You I Was Thinking 31x10.50 But I Have A Auto Tranny Do You Think That Would Be Fine Too ? I Want Boggers Too
31's will fit with no lift. 33's will fit with a lift. I wouldn't go past 33's with a four banger and auto tranny. It's going to be a turd that cant get out of its own way unless you regear it though.
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Old 06-21-2011, 09:39 PM   #6
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31's will fit with no lift. 33's will fit with a lift. I wouldn't go past 33's with a four banger and auto tranny. It's going to be a turd that cant get out of its own way unless you regear it though.

I'm Not Sure About It Fitting Without The Lift Stock Wouldn't Seem To Fit 31's Because They Were Oversized And Would Grind The Flares
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Old 06-21-2011, 09:42 PM   #7
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. It's going to be a turd that cant get out of its own way unless you regear it though.
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Old 06-22-2011, 10:46 AM   #8
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31,s fit on mine but i had some rubbing if the wheel was turned hard especially while backing. i put cragar soft 8s on with 4 inches of backspacing to solve that and give the tires a wider profile.
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Old 06-22-2011, 11:59 AM   #9
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It can safely tow 2000 lbs...so as long as the tire weighs less than that, you should be able to pull it. I'd put it on a trailer though so the pavement doesn't chew up the rubber...so you'll need to calculate the weight of the trailer in.
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Old 06-22-2011, 12:15 PM   #10
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It can safely tow 2000 lbs...so as long as the tire weighs less than that, you should be able to pull it. I'd put it on a trailer though so the pavement doesn't chew up the rubber...so you'll need to calculate the weight of the trailer in.
PPPSSSSSTTTTTTT....towing thread is that way! Just kidding!

I have 33's on my '05 SE, stock 4.10s and I dont have an issue on the highway. I can cruise in 6th on flat ground, hills I have to go into 5th, and anytime I need to pass I need to drop it into 4th. Other than that, no complaints here.

Oddly enough I don't even wish for another 4.0. I was getting 21mpg last week going straight from work to home, with a few little city trips.
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Old 06-22-2011, 12:19 PM   #11
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No lift, no gear change, stock wheels.....I would not go bigger than 31's. They may rub at full turn, but a washer or two behind the steer stop on each side will cure that problem.
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Old 10-21-2011, 01:01 PM   #12
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i have a 99' 4cyl automatic... 4" lift with 33's..... drives down the hwy just fine. up hills i move over to the slow lane and watch everybody pass me by!
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Old 10-21-2011, 01:05 PM   #13
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theres plenty of 4-cyl's pushing 37-40" tires. tire size isn't the problem...its the strength of your axles and gearing that matters.
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Old 10-21-2011, 01:11 PM   #14
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How do I know what gears are in my jeep? ...and if I wan to change to a lower gear to help on the hwy, how do I do that? Do I need to change both front and rear? (I assume not, but it's worth asking)
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Old 10-21-2011, 01:31 PM   #15
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How do I know what gears are in my jeep? ...and if I wan to change to a lower gear to help on the hwy, how do I do that? Do I need to change both front and rear? (I assume not, but it's worth asking)

What year, motor, and tranny do you have?

If you regear it will have to be both front and rear. If you dont, 1st time you lock it in 4x4 everything under it will blow.
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Old 10-21-2011, 01:42 PM   #16
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How do I know what gears are in my jeep? ...and if I wan to change to a lower gear to help on the hwy, how do I do that? Do I need to change both front and rear? (I assume not, but it's worth asking)
theres a couple ways to tell what gears you have...
1. tell us your year, engine and trans and somebody can guess.
2. pull the diff cover off, look at the part numbers on the ring gear and reference them online.
3. look at the stamped tags on your diff covers.
4. look up the build sheet from Jeep.
5. jack up the rear axle, block the front tires, and rotate the tires by hand, counting the number of full rotations of the driveshaft.

How you change the gears is simple - if you have to ask, you need to take it to a shop. Common price is $1200-1700, depending on your local area & labor rates.

And yes, you'd need to regear both front and rear, otherwise the axles wont turn at the same speed. You could always limit yourself to 2wd and remove the front driveshaft, then you'd only have to regear the rear.
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Old 10-21-2011, 02:22 PM   #17
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It's a 99' 4cly 2.5l with the 3 speed automatic.

...also, any idea what tranny that would be? (ax5, ax15, etc)
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Old 10-21-2011, 03:37 PM   #18
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It's a 99' 4cly 2.5l with the 3 speed automatic.

...also, any idea what tranny that would be? (ax5, ax15, etc)
tranny is a 30RH, and the axle ratio is likely 3.73 (but you still need to verify)
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Old 10-21-2011, 06:11 PM   #19
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tranny is a 30RH, and the axle ratio is likely 3.73 (but you still need to verify)
My 4cyl with the 3 speed manual has 4.10's. They all should from what I believe.
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Old 10-21-2011, 06:48 PM   #20
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My 4cyl with the 3 speed manual has 4.10's. They all should from what I believe.
Mines a 3 speed auto····
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Old 10-21-2011, 09:04 PM   #21
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theres plenty of 4-cyl's pushing 37-40" tires. tire size isn't the problem...its the strength of your axles and gearing that matters.
I would like to see a four banger run 40's and get up to speed!
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Old 10-22-2011, 01:25 PM   #22
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I'm currently running 32x11.5's on my 4cyl with stock gears and it's doing just fine...Not the fasting rig on the streets but it gets around just fine. Drove it from NC all the way down to FL and averaged around 75/80 with no problem
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Old 10-24-2011, 11:11 AM   #23
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tranny is a 30RH, and the axle ratio is likely 3.73 (but you still need to verify)
I'm changing my filter... How many quarts of ATF+4 do I need?

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