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Discussion Starter #1
This is one of those difficult questions to ask, and I'm open to all responses, but I'm really looking for owners of 3.6 JKU Rubis with autos running 35's and stock gearing.

I've got a 2015 JKUR with worn out 33 Duratracs. My rig is so heavy (winch, bumpers, skids, tools, recovery gear, etc.) that my TeraFlex leveling lift is down an inch from where it was (both front and rear).

Part of me wants to redo the lift big time (progressive springs, steering correction--the whole 9 yards) and go with 35s. But, I don't want to spend the money to regear, unless there is no other option.

So if you have a rig similar to mine (a 3.6 auto porky JKUR), and if you are running 35s, and have stock gears, is your highway power:

1) Essentialy as good as stock,
2) Okay, not great, but not worth the cash to regear, or
3) Embarrasing, and I wear a bag over my head when I drive?
 

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Lots of threads on this, already, but what's another hurt?

I had 4.10s with 35s on an average built JKURX, and didn't like it, so I regeared to 4.88, which I much prefer. I live at 5400ft, though, and 100% of my driving is at that altitude, or above. If you live at sea level, and on flat terrain, your experience will be a lot different than mine.

Mark

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I’ve had 3 rubicons with autos and 4.10s and 35’s and completely satisfied. I live in Montana where speed limits are as high as 80mph and lots of elevation changes. I have pulled a trailer fairly often and have not wanted for numerically higher gears.
 

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I also have 4.10s with 315/70/17s that measure at 34 rather than 35. I'm happy with it, including driving across the Sierra Nevada up to 10k feet with a bunch of camping gear loaded up.



But gearing is very subjective, many will tell you 3.73s or 4.10s is garbage, many will say it's fine. I'd recommend make whatever upgrades you want to the lift and tires, drive it for a while with your current gears and then decide if you want to regear or not. In no way will it be a must, it's not like your Jeep will fail to drive or be dangerously slow or anything.


And off road your 4:1 low range puts you in better position with 3.73s than people running the standard TC even with 5.13s.
 

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So many different opinions on this... I think what it comes down to is what you're used to. If this is your only vehicle (and have nothing to compare it to) and haven't driven a faster vehicle in a long time, stock gears will be fine. Especially if it's flat where you are. If the Jeep felt really slow from day one, you will want to re-gear.

I've had fast cars/SUVs and even my wife's Beetle feels like a little sports car compared to my Jeep. On my test drive, I asked if the e-brake was on, and I have 4.10's. After upgrading to 33's I thought Discount Tire put the e-brake on. Swapped those out for 34x10.5 KO2's (skinny, light) and these were "acceptable" to me. Feels more like stock.
 

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I have a Rubiconized sport.
E-disco, Mopar crate axles with 4.10's and auto, 315's, steel bumpers/winch, and live in upstate NY. Drive mostly rural/town/state roads, in the foothills of the Catskills, as well as 520 mile road trips to snowmobile camp in the winter for 3 months.
I will not be going to 37's, and like my 4.10's, and wouldn't consider regearing. We do mostly overland style of off roading in the woods/mountains of NY and they work out fine for our use. I have driven Jeeps since the early '70's and appreciate them for what they are. If our JK was a hard core, strictly off road, kick ass wheeler, it would have much lower gears, or a Cummins ;), or both.

Drive it for awhile and see what you think, if you feel the need to regear, go for it, if not enjoy it the way it is. There are alot of folks on these interweb forums that will have you believe your Jeep will be so anemic, that it won't run, this is just not the case.
Good luck with your decision.
 

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So many different opinions on this... I think what it comes down to is what you're used to. If this is your only vehicle (and have nothing to compare it to) and haven't driven a faster vehicle in a long time, stock gears will be fine. Especially if it's flat where you are. If the Jeep felt really slow from day one, you will want to re-gear.

I've had fast cars/SUVs and even my wife's Beetle feels like a little sports car compared to my Jeep. On my test drive, I asked if the e-brake was on, and I have 4.10's. After upgrading to 33's I thought Discount Tire put the e-brake on. Swapped those out for 34x10.5 KO2's (skinny, light) and these were "acceptable" to me. Feels more like stock.
I’ve owned an embarrassing number of vehicles including cars and motorcycles that were and are considered fast. I still find my jeep just fine.
 

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Bag.....

I wouldn’t let regearing keep me from lifting and throwing on 35s. Do it and see how you like it. Truth is my lift cost more than my regear and the tires if they weren’t on sale are pretty close too if you replace all 5. Good luck and let us know when the 4.88s go in.


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I have an automatic 2016 JKUR that had 3.73 gears in it when I put my 2.5" AEV Dualsport XT lift and 35's on it. You could say my rig is "porky" as I have an AEV roof rack with a James Baroud hard shell RTT on top and I have a trail kitchen setup in the cargo area as well as all my overlanding gear, compressor, recovery gear, chairs, etc.


I struggled with the 3.73's and re-geared to 4.56's and am much happier. Probably could have even gone to 4.88's but no "buyer's remorse". YMMV
 

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Discussion Starter #10
First, thanks to all who responded. I know that this is very subjective.

I'm really very conflicted--I know what I want but I'm not sure I want to spend the money to get there. I've got 16" wheels (I went with smaller wheels to have more sidewall to flex around rocks). Going back to 17's might make sense if I go with 35's. My lift isn't much of a lift anymore (see my first post) and the one thing I really dislike about my Jeep is the braking. But it looks like Mopar is no longer offering their big brake kit, and the Crown sounds like it has fitment/quality issues.

So I need new tires and I'd like to fix my lift, all with an eye to somewhat better offload capability. If I won the lottery I get new wheels, a high quality 2.5" lift with all the trimmings, bigger brakes all around, and a re-gear. What I'm trying to find is some middle position that won't lead to regret.

What I really should be focusing on is the brakes and build around that solution, since that is my biggest niggle.
 

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The Crown kit is fine. I'd buy it (again) without worry.

And if you hate your brakes now, you'll positively loath them if you move to a larger tire. Heavy rigs with long levers are tough to stop. Crown+Mopar (MC/booster)+Dynatrac(rears) fix that problem.

Mark

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The only reason I regeared is for highway performance. Mine is a manual, I have a bit deeper OD and I got tired of shifting gears just to maintain the speed limit every time I encountered hill or was driving into a head wind. As I added weight it only got worse. Once I went to 35's OD was basically useless except on totally flat roads and speeds greater than 65 mph that where flat, no headwind and I was empty. Once I loaded up and attached the trailer it was shiftfest time again.

I have a history of high powered vehicles and the Jeep is not in that category. The only choice we have other than a power adder or an engine swap is gears. Now that I have 4.88's I am fairly pleased though sometimes I think I should of gone to 5.13's especially when I get above 6000 ft. Of course it really comes down to how your rig is built, mine is very heavy, 5800 lbs if I am fully loaded, over 6000 lbs if the trailer is attached. The attached picture is probably the heaviest I have run and that is over 8000 lbs and no issue maintaining the speed limit in OD other than the mountain passes.

One last point I would I would like to make. What is the big deal about saving money by not regearing. People spend $2500 on wheels and tires, $2000+ on a lift, another $2000 plus on bumpers and winch. The list just goes on and on. But when we talk about regearing, something that you will use everyday unlike everything above, well that is just to much money. Well it may be to much money for strictly a Mall Crawler but if you want to get out and explore, on road or off it is probably the most useful mod you will do to your vehicle. Just ask any of us who have down it, I doubt you will find one person who has said I wish I would not have done it.
 

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Im running 35x11.50 Nitto TGs on my auto Recon with 3.73s. I was honestly surprised how peppy it still felt after the bigger tires. I am planning on regearing, but Im in no rush. It even does well on the sand in Hi Range still. Im not running heavy plate bumpers or a winch though. When I do regear it will be to 4.88s or 5.13s since Im planning on going to 37s eventually.

If I were you, I would do the tires first and then assess your own opinion on how it feels. I would bet that you would want to regear with the bigger tires, but I would make sure your content with the 35s for awhile first. I'd hate to put 4.56s in for the 35s and then realize you want to go bigger and have to regear twice.
 

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@64Chevy. Unless I missed it, you said stock gears in an automaric Rubicon.
Can I assume you have 3:73 gears.
The 4:10 was standard in the manual transmissions and optional in the automatic.
 

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3.73 with 35s is pushing it, 4.10 with 35 is a good compromise for wheeling a DD.. coming from 5.38 on 37s with the 3.8 Auto, I am Satisfied with 4.10 and 35 for a DD and weekend warrior. Lol but I may not be so happy when I go back to 37” Pitbulls.


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Discussion Starter #16
AFAIK I have the 4.10 gears. When I get home tonight I'll check the window sticker to confirm. If for some reasons I'm delusional and I have 3.73's then I'll need to regear almost certainly.

Does anyone have a general idea what a re-gear costs? I do a lot of my own work, but this is something I wouldn't tackle.
 

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AFAIK I have the 4.10 gears. When I get home tonight I'll check the window sticker to confirm. If for some reasons I'm delusional and I have 3.73's then I'll need to regear almost certainly.

Does anyone have a general idea what a re-gear costs? I do a lot of my own work, but this is something I wouldn't tackle.
It varies widely. I had Northridge 4X4 do mine, $1400 complete.
 

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4.10's and 35's suck. 17 JKUR auto with 4.10's on 3.5 MC gamechanger running 315/70r17 mt atz p3. After about a year and a half setup this way, I'm looking to re-gear. Can't stand how under-powered this is. At 80 mph it can't stay in 5 th gear, constantly down shifting. Go with 4.88's.
 

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Discussion Starter #20
Just checking back in. I have 4.10s--so says my window sticker. I plan on going with 35's--I'll try the current gears and see. Thanks to all who weighed in.
 
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