35-11.50-r17 Tires and 4.10 Gears

[tstrong]

Hello, I’ve got a 2022 v6 Gladiator Rubicon with stock 4.10 gears. I will be going from my stock 285-70-r17 (Wildpeaks 63lbs) tire size up to 35-11.50-r17 (Ridge Grapplers 66lbs) tire. Does anyone have any experience with this setup? I do a fair bit of highway driving. My hope is that I can stick with the 4.10 gears. Thanks everyone!

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[Shopshirt]

This thread is a good read and has a gear calculator posted https://www.jeepgladiatorforum.com/...my-2022-jeep-mojave.71154/page-2#post-1164653

http://www.grimmjeeper.com/gears.html

The trans is ZF 8HP55
Use NVG241OR for Rubi trans case
Use NVG241 for sport / overland case.

Enter whatever you want to compare in the tire and gear settings.

Seriously charts are stupid. This works SOOOO MUCH BETTER.

Jurfie created the chart below based on that calculator YMMV.

Ok y'all; first run at it. This is for those who want to try to maintain stock performance and fuel economy when going to a larger tire size.

I used the stock RPMs to determine 1800-2200 is the range to maximize MPGs since that is where the RPMs fall on the various models and I assume FCA felt 2000 RPM is the sweet spot for fuel economy. The green boxes fall between that range.

As per the discussion, this is just a rough starting point to see if you think regearing will help you to maintain STOCK performance on the highway at 70 MPH and regain/maintain all 8 gears on the automatic. IT DOES NOT APPLY TO THE MANUAL.

You'll notice that going to 37s with the 4.10s is not that far outside the range, hence why many feel it is unnecessary to regear - YMMV.

Edit: Note I included the stock Rubicon tire size with 3.73s for those who put take-offs on their Sport/Overland.

 

[Badunit]

Opinions vary wildly. Some think 3.73 is great with 37" tires. Others are on the opposite end of the spectrum and will do 4.88 (or steeper) with 35's. And then there is the cost-benefit analysis: is there enough to be gained by a $3K regear? My advice is to try the 35's without regearing. You'll not get into 8th as often but you may be okay with that. Decide after getting some time behind the wheel. In any case, it isn't going to be a killer to leave it at 4.10 and I think most people would do that, if for no other reason than to save the $3K.

For reference, I recently regeared to 4.56 with the stock 33" tires to help keep it from downshifting so much out of 8th. I haven't had a chance to drive enough to give a solid verdict on performance and mpg.

 

[redriderjf87]

With 4.10s I wouldn't lose much sleep over it.

Worst case your 8-speed might become a 7-speed (depending on how fast you drive on the highway). I'm assuming you have an automatic that is.

 

[PsyRN]

Opinions vary wildly. Some think 3.73 is great with 37" tires. Others are on the opposite end of the spectrum and will do 4.88 (or steeper) with 35's. And then there is the cost-benefit analysis: is there enough to be gained by a $3K regear?

This.

In my experience with Ridge Grapplers 35x12.5x17 on stock wheels on my Rubicon is that it will be fine. I would measure your tire before you calibrate the tire size in the system. I initially put it at 35" and the shift points were off and it rarely hit 8th, so I actually measured it and it's more like a 34.3. So recalibrated the speedometer to the closest setting and it runs fine. I hit 8th on the highways all the time.

 

[HorneyBadger]

You are on the very low spectrum for 35's. Even 4.56 gears are on the low but..... it really depends on your driving and whether you have alot of hills. You will feel it going uphill. I have a friend who runs 35" Wildpeaks MT's on the original 4.10's and he follows me everywhere with slightly less gas mileage. I second Redrider, run em for awhile and then make the decision whether to re-gear. My overland was a dog on 3.73's and 35's. Re-geared it to 4.56 after a trip I took.

 

[SRO]

My experience is 35s are fine on the 4.10s. It was about 100rpm difference at 75. It made a difference, but it was small. I went from stock MTs to Toyo ATs (so less aggressive) when I upsized and my mileage didn't drop considerably. It's maybe a little lower, but it's not more than 1/2 an mpg.

 

[Uparms]

35s work great with the 4.10, down low and up on highway. Gas milage not bad either on a 2020 Sport, Max Tow. 17/20.

 

[aldo98229]

I did 35s on four of my JKs with 4.10 gears without issue. Granted, they had either the 6-speed manual or the 5-speed automatic.

My 2018 JL with the 8-speed auto and 3.45 gears was a dog on 35s. It wasn’t until I regeared to 4.88 that it all came together!

 

[InvertedLogic]

I'm pretty sensitive to gearing changes but have been happy with 35s on 4.10s with the auto trans at least. If I had a MT that may not be the case. After re-programming the tire size, I still see 8th gear regularly and it cruises well still at altitude here in CO. MPG-wise I get 17 around town and 20-22 on the highway.

 

[tstrong]

With 4.10s I wouldn't lose much sleep over it.

Worst case your 8-speed might become a 7-speed (depending on how fast you drive on the highway). I'm assuming you have an automatic that is.

I’ve had 35x11.50’s with 4.10 for almost a year with no issues. You should get a speedometer calibration device to get the transmission to shift right. I use https://ecri.app/

I have a Tazer Mini on order. Thank you for the feedback. Glad to hear that, I’m a bit nervous with the Ridge Grappler’s E load rating regarding ride quality. But it seems to be a good tire for most people.

 

[FL_GA-Wolf]

I have a 2020 JTR stock rims 35X11.50T17 Toyo AT III. I have no issues with this set up. I drive over 60 miles everyday on the highway. Get around 19 to 21 mpg. Jeep setup the Gladiator to run on 35s from the factory. Jeep already knows we are more then likely going to large tires. It will be fine for a daily drive. You will need to adjust your spedo to get an accurate speed.

 

[Dryfly24]

That’s what I run and I’m fine with it.

 

[CJ5w4wdSmokyOnMyTail]

Hello, I’ve got a 2022 v6 Gladiator Rubicon with stock 4.10 gears. I will be going from my stock 285-70-r17 (Wildpeaks 63lbs) tire size up to 35-11.50-r17 (Ridge Grapplers 66lbs) tire. Does anyone have any experience with this setup? I do a fair bit of highway driving. My hope is that I can stick with the 4.10 gears. Thanks everyone!

I have a Mojave on 35x11.5 Toyo Open Country AT3 tires (weight 67 pounds) on 4:10 gears and have had zero issues. I bought the Toyos mostly because they were among the lightest 35s. I can't compare to stock, though, because I switched out the stock Wildpeaks for the Toyos within two weeks of buying the truck. But I can say that power and shifting is really good. I did also calibrate for the larger tires with a Tazer mini. You should be totally fine.

 

[1996XJ]

One thing i never see answered... is it bad for the transmission to be running larger tires without the regearing?

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