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Old 05-15-2019, 12:18 AM
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Another 35s to 37s question

May seem stupid but im wondering, so here goes. Will 37s that weigh the same as 35s be the same strain on Jeep? There's only maybe a true inch in height difference and ive only read concerns due to tire weight. Any opinions will be appreciated, thank you.

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Old 05-15-2019, 12:47 AM   #2
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No. The 37, being larger, has a higher rotational momentum. This results in more power being required for acceleration, more power being dissipated while braking, more gyroscopic force in corners (affecting ball joints and steering) and because 37’s are often wider you’ll need less backspace, also affecting ball joints (longer “lever”)

Larger tires are often harder to balance so there’s potential for more vibration with all that entails.

Finally if off-roading you’ll have more grip from the larger tires (a plus) resulting into more strain on axles, axle shafts, diff gears etc.

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Old 05-15-2019, 09:19 AM   #3
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That ^^^^.
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Old 05-17-2019, 10:01 AM
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No. The 37, being larger, has a higher rotational momentum. This results in more power being required for acceleration, more power being dissipated while braking, more gyroscopic force in corners (affecting ball joints and steering) and because 37ís are often wider youíll need less backspace, also affecting ball joints (longer ďleverĒ)

Larger tires are often harder to balance so thereís potential for more vibration with all that entails.

Finally if off-roading youíll have more grip from the larger tires (a plus) resulting into more strain on axles, axle shafts, diff gears etc.
That settles it, ill stick with my 35 Mud Grapplers, wanted to get 37 Discoverer Pros but more of a want than a need.
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Old 05-17-2019, 10:10 AM   #5
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It really does make me wonder if 37s are worth it. Seems to me that if you are going to jump through all of the hoops needed to move from 35 to 37 and actually crawl with them you might as well go ahead and set up for 40s.

I am also going to stick with my 35s until itís time to go full rock buggy. I see many Jeeps running 37s out there these days but Iím guessing that the majority of them have not done the work to take care of the gearing, steering, and braking mods that would render them useful off-road.


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Old 05-17-2019, 10:20 AM   #6
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It really does make me wonder if 37s are worth it. Seems to me that if you are going to jump through all of the hoops needed to move from 35 to 37 and actually crawl with them you might as well go ahead and set up for 40s.

I am also going to stick with my 35s until itís time to go full rock buggy. I see many Jeeps running 37s out there these days but Iím guessing that the majority of them have not done the work to take care of the gearing, steering, and braking mods that would render them useful off-road.


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I think you're right on.

Many sanctioned rides are limited to a 37". That's the main reason we built our '18 to run a 37" as the max size.
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Old 05-17-2019, 10:21 AM   #7
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I see many Jeeps running 37s out there these days but Iím guessing that the majority of them have not done the work to take care of the gearing, steering, and braking mods that would render them useful off-road.
Yeah. Anyone can run 37's so long as they're really careful and treat their Jeep like a delicate little flower.
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Old 05-17-2019, 10:24 AM   #8
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It really does make me wonder if 37s are worth it. Seems to me that if you are going to jump through all of the hoops needed to move from 35 to 37 and actually crawl with them you might as well go ahead and set up for 40s.

I am also going to stick with my 35s until itís time to go full rock buggy. I see many Jeeps running 37s out there these days but Iím guessing that the majority of them have not done the work to take care of the gearing, steering, and braking mods that would render them useful off-road.


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I disagree. For me I have no intention of going to 40s so I'm covering by bases for 37s only. I'm not opposed to running a Dana 60 or larger but it's just not necessary for 37s. I know that a lot of people run 40s on beefed up D44s but it it's only a matter of time before the ring and pinion goes.

But yeah, if you want to eventually go to 40s then try and do the work once.
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Old 05-17-2019, 10:54 AM   #9
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It really does make me wonder if 37s are worth it. Seems to me that if you are going to jump through all of the hoops needed to move from 35 to 37 and actually crawl with them you might as well go ahead and set up for 40s.
"Worth it" is really a personal judgement. I see people spend $6K on a car stereo, but to me I see no value in that. I have 60s with 37s and IMO it's a perfect balance between street and off road. I have no intention to go to 40s as long as I still drive on the streets. - The 3.6L is OK right now with 37s, but for 40s to have any street drivability a LS3 would be needed (at least for me). Now if I dedicated the Jeep to trail only that's a different story, I could live with the 3.6L. But, buying a truck and a trailer is really not any less expensive than going LS3. So there goes another $30K.

Think about all the money dumped into the D44 upgrades, especially if it's not a DIY job. Take that money and instead sell the D44s and your almost half-way to 60s. Keep in mind that D60s include the front and rear brake calipers (a necessary upgrade for 37s, really 35s as well). Then there is the benefit of locking hubs (I know, I know, some people don't like to get out and lock).
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Old 05-17-2019, 05:49 PM   #10
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Yeah. Anyone can run 37's so long as they're really careful and treat their Jeep like a delicate little flower.
From last weekend on Hackberry trail, treating my "jeep like a delicate little flower" on 37s


Mommymallcrawler and pressurized have witnessed my jeep being a "delicate little flower" too.

However, I did not just throw 37s on my jeep and call it good. BBK front and rear, Chromoly axle shafts, regear, drive shafts, ball joints and gussets/truss on both axles. I built my jeep to be undelicate and drive it as such.
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Old 05-17-2019, 08:04 PM   #11
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Well yeah!! Obviously!! 🙂

My delicate flower comment is referring to people with stock Jeeps on 3.21’s just cutting their fenders and slapping 37’s on.
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Old 05-20-2019, 10:37 AM   #12
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@badAZbiker is one of the least indelicate flowers I know LOL - he built his Jeep to do what he needs to do. Notwithstanding I do also remember a certain meet and greet where said blue limo was small and unbuilt "I dont need big tires, I'm not going to thrash my Jeep around on those hard trails". Time changes everything!
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Old 05-20-2019, 11:25 AM   #13
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"Worth it" is really a personal judgement. I see people spend $6K on a car stereo, but to me I see no value in that. I have 60s with 37s and IMO it's a perfect balance between street and off road. I have no intention to go to 40s as long as I still drive on the streets. - The 3.6L is OK right now with 37s, but for 40s to have any street drivability a LS3 would be needed (at least for me). Now if I dedicated the Jeep to trail only that's a different story, I could live with the 3.6L. But, buying a truck and a trailer is really not any less expensive than going LS3. So there goes another $30K.



Think about all the money dumped into the D44 upgrades, especially if it's not a DIY job. Take that money and instead sell the D44s and your almost half-way to 60s. Keep in mind that D60s include the front and rear brake calipers (a necessary upgrade for 37s, really 35s as well). Then there is the benefit of locking hubs (I know, I know, some people don't like to get out and lock).


My take on this is, it also depends on the 37Ē tire you choose and the 35Ē your are coming from. A 35Ē Pitbull is almost as big as a lot of the 37Ē tires out there for instance.

As for D60, If you are gonna run D60 go 40s. You will loose enough diff clearance that 37s on D60 will have same clearance as 35s on D44. So you gain strength but not diff clearance. 2Ē extra is still 2Ē extra. 40s on the D60 will be about the same Diff clearance as 37s on D44.


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Old 05-20-2019, 04:19 PM   #14
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From last weekend on Hackberry trail, treating my "jeep like a delicate little flower" on 37s. Mommymallcrawler and pressurized have witnessed my jeep being a "delicate little flower" too. However, I did not just throw 37s on my jeep and call it good. BBK front and rear, Chromoly axle shafts, regear, drive shafts, ball joints and gussets/truss on both axles. I built my jeep to be undelicate and drive it as such.
What size lift and tires is the Jeep up front running btw?
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Old 05-20-2019, 06:26 PM   #15
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Another 35s to 37s question

This is total suspension and body lift of 5Ē with 37x12.50x17 Pitbulls and flat fenders . If you are interested.


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Old 05-21-2019, 11:19 AM   #16
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Not sure if I am all correct here because I just went by intuition.

Jeep wrangler torque at engine is 260lb-ft.

On a simple online calculator, increasing the tire 1 inch from 34 to 35 essentially increased the output at the tire tread by 2.5% and close to 2.5% again from 35 to 36.

The way I look at that is 5% weaker output for the vehicle to the ground, and 5% greater wear and strain on the engine, other parts not considered.
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Old 05-23-2019, 11:21 PM   #17
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From last weekend on Hackberry trail, treating my "jeep like a delicate little flower" on 37s

https://youtu.be/X8Ua0yZ0RXM
So where is the video of the trail?

All I see is what we call around here an "access road" to the real trail...

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Old 05-24-2019, 10:04 AM   #18
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So where is the video of the trail?

All I see is what we call around here an "access road" to the real trail...


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Old 05-24-2019, 10:56 AM   #19
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These are the trails I like to play on. I am still running D44's that have been built up a bit
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Old 05-24-2019, 11:37 AM   #20
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These are the trails I like to play on. I am still running D44's that have been built up a bit

I use boots for those trails, much faster than the Jeep.
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Old 05-24-2019, 11:51 AM   #21
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If you're really going to wheel with 37's, the cost of the tire is only the beginning. 37's keep a lot of 4x4 shops in business.
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Old 05-25-2019, 06:10 PM   #22
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What size lift and tires is the Jeep up front running btw?
I think he is running a 3" teraflex with a 1" body lift on 35's
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Old 05-25-2019, 07:11 PM   #23
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We are, and have been, running 37s on our 2012 Rubicon. We have re-geared to 4.88s. It's also a manual (that matters). Adam's 1350 drive shafts. It has been handling the abuse of relatively difficult crawling for almost a year.

That said, we've fully intended to upgrade soon and that will be happening this next week. RCV front axles, Teraflex ball joints and Synergy C Gussets. We'll also put on the Teraflex front BBK.

Famous last words but I think that'll be it. Honestly, with that done, we might move to 39s.

If/when things break, we'll upgrade. I don't plan on doing D60s and 40s.

Our Instagram page (at Kodathejeep) has some videos of a few things we like to do. We'll be running a 7 rated trail with GenRight on Tuesday and that's a pretty easy trail for us, while still being a fun challenge.

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Old 05-26-2019, 07:38 AM   #24
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We are, and have been, running 37s on our 2012 Rubicon. We have re-geared to 4.88s. It's also a manual (that matters). Adam's 1350 drive shafts. It has been handling the abuse of relatively difficult crawling for almost a year.

That said, we've fully intended to upgrade soon and that will be happening this next week. RCV front axles, Teraflex ball joints and Synergy C Gussets. We'll also put on the Teraflex front BBK.


If/when things break, we'll upgrade. I don't plan on doing D60s and 40s.


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Iím running the exact setup, but Iím also sleeved. Been running 37s with no issues, while Iím seeing plenty others break. The D44s will last as long as you beef them up.
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Old 05-26-2019, 09:48 AM   #25
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Iím running the exact setup, but Iím also sleeved. Been running 37s with no issues, while Iím seeing plenty others break. The D44s will last as long as you beef them up.
Thought about sleeving but there is such a minimal gain.

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