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post #1 of 66 Old 05-18-2015, 03:55 PM Thread Starter
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35's or 37's?

My jkur will need tires in the next couple months and I really have the itch to move to 37's. I currently run 35's with the stock 4.10's and I have already beefed up the front axle. I know many have made the move to 37's with this set up but I also tow a 3000lb travel trailer and plan to take it with me when I go to Moab next year. Ideally I would be able to drop in 4.88's and that is the plan but it may be awhile before I can do that. Would I be miserable towing cross country with the 4.10's and 37's? I don't want the trip to be miserable and be wishing I had stuck with 35's until I could make the gear change. For what it's worth it pulls great as is, even in the steep hills of WV.
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post #2 of 66 Old 05-18-2015, 04:54 PM
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go with something like the bfg kO2 in 37's and you will really be at 35.5's so might be perfect. I think that is what I am going to do next time around. A little bigger then my current 35 toyos but not like real 37's
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post #3 of 66 Old 05-18-2015, 05:38 PM Thread Starter
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I considered that as well, not necessarily going with a bfg, but many 37's run closer to 35 anyway. I've been eyeing some mastercraft courser mxt' s in a 37. My local dealer can sell em at 278 apiece and I think they run right around 36 in.
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post #4 of 66 Old 05-19-2015, 09:10 AM
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Originally Posted by family4x4 View Post
I considered that as well, not necessarily going with a bfg, but many 37's run closer to 35 anyway. I've been eyeing some mastercraft courser mxt' s in a 37. My local dealer can sell em at 278 apiece and I think they run right around 36 in.

if it helps, the AWESOME ( yeah, I am touting them now) KO2s in 37" flavor on my (light) JKUr came to just a 10th over 36"....so, they run smaller, as is the norm...I went for "multi-bird-killing-with-one-stone" ( i.e.- until next years regear/locker/axle upgrades & I hadda get rid of my beloved by no one but me 16" wheels )


<edit: darn, that image was bigger than I had intended...srry!>


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post #5 of 66 Old 05-19-2015, 09:31 AM Thread Starter
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Originally Posted by j3ff3ry_j33p View Post
if it helps, the AWESOME ( yeah, I am touting them now) KO2s in 37" flavor on my (light) JKUr came to just a 10th over 36"....so, they run smaller, as is the norm...I went for "multi-bird-killing-with-one-stone" ( i.e.- until next years regear/locker/axle upgrades & I hadda get rid of my beloved by no one but me 16" wheels )


<edit: darn, that image was bigger than I had intended...srry!>


What gears are u running with those? Being an 11 I assume you have the 3.8? If you're running 4.10's are u happy with the power at that tire size?
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post #6 of 66 Old 05-19-2015, 09:53 AM
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Originally Posted by family4x4 View Post
My jkur will need tires in the next couple months and I really have the itch to move to 37's. I currently run 35's with the stock 4.10's and I have already beefed up the front axle. I know many have made the move to 37's with this set up but I also tow a 3000lb travel trailer and plan to take it with me when I go to Moab next year. Ideally I would be able to drop in 4.88's and that is the plan but it may be awhile before I can do that. Would I be miserable towing cross country with the 4.10's and 37's? I don't want the trip to be miserable and be wishing I had stuck with 35's until I could make the gear change. For what it's worth it pulls great as is, even in the steep hills of WV.
Well, not to make light of your hills back in WI but if you plan on taking I-70 or even I-80 plan on over heating the tranny and going like 25mph up the passes.

A friend and member here has come out from Michigan to Moab the last 7 years now and even with out towing anything, he said he does about 40 mph up the passes. He also runs 4.88 gears, had the 3.8 with sprintex super charger, 37 BFG KM2 and runs a beefed up Dana 30.

If your set on towing your trailer I would look for a set of stock tires/rims to tow your trailer to Moab.

But for your question at hand, it depends on which tires your looking at. I wouldn't go to 37's without a gear change myself, but that's just me. I also won't do it without a Dana 44 under the front end too, the 30 is on barrowed time as is.
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post #7 of 66 Old 05-19-2015, 11:30 AM Thread Starter
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It's a rubi with a beefed front 44 and I have the 3.6. I will be towing my camper to Moab but my question is to stick with 35's or go to 37's. Throwing stock tires on for the trip is just silly. A gear change is planned in the future but don't know if funds will allow it before my journey next year. I understand my speed will drop in the mountains, this ain't my first rodeo. I'm not worried about overheating the tranny, I drive sensible and don't expect to climb grade at 70. The places I camp locally require climbing grades of 9-10 degrees and I have no issues.
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post #8 of 66 Old 05-19-2015, 11:38 AM
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I'm running 37's with 4.10 gearing. Haven't towed a thing with it but I'm happy with what I have. Not sure what it would be like towing with a steep grade, but I'm happy I went with 37's instead of always wanting them "next purchase"
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post #9 of 66 Old 05-19-2015, 11:47 AM
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Im surprised at being happy with the 4.10s and 37's, I have a manual 4.10 and 35s and its terrible(IMO) on the highway. I cant keep speed in 6th
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post #10 of 66 Old 05-19-2015, 12:03 PM Thread Starter
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The big difference is the 3.8 vs the 3.6. Keep in mind the ram with the 3.6 has a tow rating of 7600 lbs so I don't believe it's a power issue.
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post #11 of 66 Old 05-19-2015, 12:42 PM
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yeah 4.10s and 35s on the highway with any slight incline was tough and couldn't keep it in 6th. i even have a relatively light rig compared to others. i now have 5.13s which is a bit much for 35s and the pentastar but 37s are coming.

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post #12 of 66 Old 05-19-2015, 01:44 PM
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Im surprised at being happy with the 4.10s and 37's, I have a manual 4.10 and 35s and its terrible(IMO) on the highway. I cant keep speed in 6th
3.6l and I have no problems... No bullshit.
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post #13 of 66 Old 05-19-2015, 02:23 PM
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What gears are u running with those? Being an 11 I assume you have the 3.8? If you're running 4.10's are u happy with the power at that tire size?
I can confirm that the 4.10s feel not one bit different with these "D" rated 37s than it did when the ( heavy) "E" carcassed 315/75r16 STTs were on it ; that is one of the criteria I had to conform to ; I wouldn't go to a 37" that weighed over 75lbs or I would have felt the weight ....the gain I saw was a mere 4lbs per wheel and tire ....it is more than livable until I get 5.38s and then (maybe) the new consumer version of the Falken MT will be available ---if not , I was so impressed with the Cooper STT , I will probably get the 37" of that ....no way was I jumping from a 65lb to an 84lb tire on this gearing ......thus, the KO2 filled a need to (a) get rid of 16" wheels (b) not weigh more than 74lbs and (c) fill my trimmed fender wells and 3" Synergy lift....answered all three...turns out it's a freaking rocking tire as well!

oh-per the above, I have the Auto slushbox and can't recall the last time I enabled overdrive ( this is 80% off-road Jeep....)...although the road miles are at 80mph between Nashville and Atlanta .... I also programmed via Flashpaq FWIW....

last edit to OP: no way would I wanna tow anything with this setup....it'd push it beyond what I could deal with even with a fan cooled aux tranny cooler....


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post #14 of 66 Old 05-19-2015, 03:21 PM Thread Starter
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So is it the extra weight of the tires that's my biggest issue? The tires I'm considering are 5 lbs heavier than what I run 68lbs now-73lbs New tires
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post #15 of 66 Old 05-19-2015, 09:32 PM
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I'm not worried about overheating the tranny, I drive sensible and don't expect to climb grade at 70. The places I camp locally require climbing grades of 9-10 degrees and I have no issues.
Take a look at Esinhower pass on I-70, it's no cake walk. The reason for the stock tires is so you can pull the trailer and not over work your Jeep. Put the bigger tires in or on the trailer. I think my friends spend about $1000 in fuel coming out to Moab each year with out pulling a trailer. Smaller tires will get you better MPG which is more money in your pocket.

If your jeep is your DD, then re-gearing will pay for its self rather quickly.

The size difference isn't that big of a change. And to me I'd stick with what you know right now. You're not going to gain much if anything with the change in size but you are almost certain to lose performance.
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post #16 of 66 Old 05-19-2015, 09:57 PM
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So is it the extra weight of the tires that's my biggest issue? The tires I'm considering are 5 lbs heavier than what I run 68lbs now-73lbs New tires
grumpy5 has valid points ; yes , the weight as well as the diameter of the tire /rotational weight and other components will affect the performance collectively and if you're towing up vast hills you'll be far happier with regearing ... my choice was due to my being a moron and under the impression that three years down the road is be able to buy the STT in a 325/80r16 or the KM2 in the 345/75r16 but those are unicorn tires , I found myself either going to 17s for future MT purchase after gears of an MT in 37" on 17s or I could stick with the 315 or 35s ...I trimmed the fenders for clearance at compression and the tires were too small ....it's a long , costly , stupid price for not getting 17s when I got the Jeep...don't try to drive up mountains with 4.10s and 37s if you're towing what'd you say , 1000lbs? nah... get gears man....I do notice a sluggishness with just my wife and two kids in the rig with spare on simply climbing monteagle, tn so I wouldn't wanna know what towing that much would feel like ...
I was in a special situation - didn't want to wear out the 35s so much I couldn't sell them - and yours is a bit different....I am not towing loads across Colorado or wherever


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post #17 of 66 Old 05-19-2015, 10:01 PM
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Originally Posted by family4x4 View Post
So is it the extra weight of the tires that's my biggest issue? The tires I'm considering are 5 lbs heavier than what I run 68lbs now-73lbs New tires
What's the size difference? What's the actual size of your 35's vs. the actual size of the 37's you're considering? Unfortunately, I think the 3K lb trailer may be a bit much on the 4.10's. The trailer is the deal breaker.
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post #18 of 66 Old 05-20-2015, 12:18 AM
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^X2 on the trailer.
If it weren't for that factor, you'd be ok for what you're running....maybe drive someone's that has tht setup and try it for yourself>?


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post #19 of 66 Old 05-20-2015, 07:56 AM
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Is it just me, or the point of buying a 37" tire that is closer to a 35" tire. but still costs the same as a 37" tire, kind of counterproductive?
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post #20 of 66 Old 05-20-2015, 09:28 AM Thread Starter
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Thanks all for the input. My current 35 inch coops with 25% remaining are about 33.5 measured on the jeep. I still have a month or two before I have to get new tires, just don't know if I can swing the gears yet. It looks like I'll be sticking with 35's if I can't. I will be taking almost a month off work to make this trip as well as see as many sights as we can along the way and may include some wheeling in Colorado, so the camper will be a must. It would cost a fortune in hotel rooms an we prefer having our own bed every night.
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post #21 of 66 Old 05-28-2015, 09:26 AM
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Is it just me, or the point of buying a 37" tire that is closer to a 35" tire. but still costs the same as a 37" tire, kind of counterproductive?
the 37" KO2 came-in at 36.10 to 36.25 mounted and aired to 29psi on my rather light (4750lbs) four door...compared to the 33.45" my half-worn 35" STTs were at I am pleased by the extra clearance of the tires , even if it isn't exactly 37" ...
<EDITED: I forgot I had posted an already too-large pict of my jeep previously and didnt mean to post a 2nd like that- removed image-JJ>


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post #22 of 66 Old 05-28-2015, 04:54 PM
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The big difference is the 3.8 vs the 3.6. Keep in mind the ram with the 3.6 has a tow rating of 7600 lbs so I don't believe it's a power issue.
Yes but a JKa 2 door max is 2000, 4 door is 3500 lbs...HP is a small part of what figures into the capacity.

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post #23 of 66 Old 05-28-2015, 08:20 PM
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Yes but a JKa 2 door max is 2000, 4 door is 3500 lbs...HP is a small part of what figures into the capacity.
that would be an incredibly base/absolutely no option 4 door if weighing 3500lbs,right CT Performance? I was thinkin more 5300lbs....typo, yesh?


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post #24 of 66 Old 05-28-2015, 08:33 PM Thread Starter
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I understand there is more to the tow rating than just horsepower, and the best I can figure is our jeeps limitations are the weak stock suspensions. Like I said, I'm towing near my max now and power really doesn't seem to be an issue. That's why I was hoping I could swing 37's with my factory gearing but I don't want to press my luck.
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post #25 of 66 Old 05-28-2015, 08:36 PM Thread Starter
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If I'm not mistaken the very same jeeps we drive in the US have much higher tow ratings in Europe. I believe the 4 dr is somewhere around 5k tow capacity across the pond.
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