How do 4.88 axle gears and 35" tires affect fuel economy in a Jeep Wrangler?

[@knightscape]

Stronger sway bar will help with your handling in the wind. I got the ORO swayloc. Instantly improved my handling… only lost about an inch or two of flex on the disengaged position from completely removing the swaybar.

[@caseycrawls4466]

I'll have to check that out.

[@johnbeebe1190]

I have 4.88 ratio' in my Rubicon. However I have an L-83 Gen 5 V8. I'm calculating 19.3 MPG with the GMC 8 speed transmission. The tire size is 37"". RPM at 70 is 2200. 2 door.

[@caseycrawls4466]

Oh man...I'd love to see pics of your Jeep and the engine.

[@PawPaws_Place]

I lived in Katy for years. Now I’m up the road a bit in Cypress. 👍

[@caseycrawls4466]

Sweet! Cypress is a nice area!

[@prostreet85c10]

NE houston area here

[@Nodnarb1776]

The new 8 speed is nice. I have a 2015 automatic with 4.88 gears and 35s. Mine gets 14 mpg running 2,900 rpm at 70 mph.

[@caseycrawls4466]

Oh wow...mine isn't quite that high. Appreciate the comment.

[@davidgore5719]

So the question is what mileage did you get after installing the 35's but still running 4.10s (b4 the gear swap)? Reason I ask is I have a 2003 Jeep TJ Rubicon (48K miles) and I installed 35's last year but still running the 4.10 stock gears. I'm getting about 12mpg, but going to 35s without gear swap makes my fifth gear largely unusable other than absolute level ground. I have the 5-speed manual. Looking at going to either 4.56 or 4.88 gears and wondering if I'll gain a little MPG since I'm outside the target RPM band and have to get pretty heavy into the throttle to keep up my speed...., especially in hilly terrain. Going to a lower gear will put me closer into the band and I will not need to get into the throttle like I currently do. Not sure though. In the end, going to 35s put me between 1-2 lower MPG but I'm hoping to gain at least half that back by re-gearing. How do you think the gear swap will affect my mileage?

[@gabrieldalcomune3044]

Thanks for the video, I’ve been debating between 4.56 or 4.88 for my JLU with a 2.0. Not sure I plan on going 37s as 35s feel like plenty for now for my wheeling.

[@alfa8822]

I'm debating the same thing. I still haven't made my decision yet.

[@gabrieldalcomune3044]

@@alfa8822 I ended up choosing 4.56s. Probably gonna stay on 35s either way. Gonna have the shop install them on monday the 23rd along either an eaton e locker in the rear.

[@alfa8822]

@@gabrieldalcomune3044 do you usually carry a lot of gear inside your jeep? I don’t plan on pulling a trailer but I will have a roof top tent and overlanding gear in the back.

[@gabrieldalcomune3044]

@@alfa8822 Nah my jeep stays very light most of the time. If I go out to the trails at most it’s some tools, food, and water. Working getting a few spare parts to keep in the stockpile in case anything breaks while i’m away from home. Mostly shafts and tie rod ends I wanna have ready. That and with a 2.0, IF i do go to 37s it’s not that bad RPM wise apparently. A few XRs on the forum still get 8th gear with 37s and the 2.0.

[@mwp597]

I went with 4.56 and now wish i would have went with 4.88's. I'm thinking of spending the 2500 to go to 4.88's. I do a lot of mountain pass driving and off road driving in the mountains i feel like i don't have enough gears some times. I own a 2014 Wrangler JKU sport Yukon limited slip in the rear and Eaton turetrac up front.

[@PackagedBiscuit]

Hello, like the video! Have you noticed any jerking when slowing down? I’ve heard a few people say that they have had jerking when the transmission shifts down after going to 4.88s

[@caseycrawls4466]

No, I’ve not noticed anything like that. Drives very well with the 4.88 gears.

[@tripleseven8361]

Sometimes… I don’t find the transmission particularly smooth in any case…

[@tripleseven8361]

I have the same tires and gear ratio on my 2024 JLRU… I’m getting about 15.8 miles per gallon… ( Mostly driving in M8/D8)…I think I would do better if I had mostly miles and miles or flat terrain, rather than the uphill and downhill that I constantly have to deal with here, in New Brunswick, Canada…

[@caseycrawls4466]

I've found that manual calculation is a bit less than what the computer says. I'm probably around the same as you.

[@johncarlson9921]

Buckee’s is growing. On the way to Orange Beach, AL., we needed to turn south off I-10. Well, what do we find? A new Buckee’s!

[@Jeeptalkshow]

It's pretty funny we started talking about Bucees on the show, and many didn't know what it was. Listeners were most interesed in Beaver Nuggets! lol Beaver Nuggets were a big hit at a Jeep Talk Show Off-Road Texas event. :D

[@caseycrawls4466]

I love me some Buc-ee's! Appreciate the comment and thanks for watching. I listen to your show all the time...great stuff.

[@Jeeptalkshow]

@@caseycrawls4466 lol you know the saga about the Beaver Nuggets then. Have you heard about the Jeep Talk Show Morning Thunder? Saturday morning jeeps and coffee meetup in Katy.

[@caseycrawls4466]

I have and it sounds like a great idea. I'd love to attend but going out of town this weekend. Will it be a monthly thing or are y'all waiting to see what the turnout looks like?

[@Jeeptalkshow]

Yes, monthly is the plan. :D

[@Jeeptalkshow]

I'm surprised you don't have more subscribers, you have a wide variaty of Jeep content!

[@dad3562]

Great video! Think 37’s will be okay with 4.88’s? I’m looking to get the 2 door JLR in a 6 speed, V6, but order with 4.88’s and run 37’s.

[@caseycrawls4466]

Thanks for the comment…I really like the 4.88 gear and, yes, it would be great with 37” tires. I wanted the flexibility to move to a 37 when I installed the gears, that’s why I went with this gear. Good luck with your Jeep…I love this little 2 door!

[@MrCheerbo]

So if I put 35 on my gladiator I needed to re gear

[@POLLUSKY]

Yeah

[@caseycrawls4466]

You certainly don't "have to" but I would.

[@Tyler-ti9hn]

You can buy it new with 4.88

[@tripleseven8361]

Yes…My 2024 JLRU came with 4:88 from the factory…

[@TheAbeSystem]

Who did the regearing for you? I’m in Katy.

[@caseycrawls4466]

Sorry for the late response...I went to Insane Offroad. The owner, Tommy, does a great job. I've had to buddies get their gears from him with good results. Highly recommended. He moved his shop and is not located off I45 North.

[@jonyalghazili5029]

Question what the size of Jeep wrangler Sport 2019 JL axle ratio is it 4.10 any help

[@melvin5818]

depends if its auto or manual but typically you are getting 3.45 gear for sport models

[@jonyalghazili5029]

Question what the size of Jeep wrangler Sport 2019 JL axle ratio is it 4.10 any help

[@caseycrawls4466]

The sport should be 3.45 from the factory.

[@mwp597]

My 2014 JKU wrangler sport had 3.27 gears from the factory. Do a Vin number look up on line for Jeeps and that should tell you what gears you have or go a Dodge dealer let them run the vin and can tell what the gears are. You call any Dodge dealer too.