DTieu1

So, I know there are forums everywhere about re gearing. But, most of them are 3.8 L or manuals. So let me start off by saying, I have a 2014 Jeep Wrangler Unlimited with a 8 inch Lift, 35 inch Tires, and 3.21 Gearing. Its also a Automatic and has a 3.6 L motor. My question is, I use my Jeep as a Daily Driver, and also take it out on the weekends. But, Im not much of a rock crawling guy, I like to explore and find new things, and I also like to haul ass through the desert. My question is would 4.56 be perfect for my situation or should I just go with 4.88. I am in need of a regear since it drives like crap. Oh, by the way my tires measure out to 34.5 inches. So can someone please help me out. I am planning on doing it next weekend.

AZJeepRubicon

4.56.

I did 5.13's on 37's and it feels the same as 4.88's as far as power goes. if I were to do again I'd go with 4.88s so I'd say for 35's do the 4.56. 4.88 only if you think you might want 37s someday soon.

And with that much gap from tire to fender I'd consider the 37s. JMO

DTieu1

How much would I regret it driving with 4.88 for a year till I get 37's.

AZJeepRubicon

You'll be fine. RPM's will be just slightly high. 3050ish at 75. you'd be at 2900 on 4.56 so not that much different. In hindsight I just don't feel much power difference vs the 4.88 on 37s that I drove so that's why I would do 4.88s if I were to do again. I just need to get a trailer to tow to justify the 5.13s. If you do plan to do 37s I'd have no issues getting the 4.88s now

Invest2m4

Well, I thought 4.88s and 37s was almost too much. Great around town and offroad, but not so much on the highway. I ran the 4.88s for about a week on 35s - no freaking way I'd run that unless I never exceeded 55.

As noted above, your highway RPMs will exceed 3000. Do the math, and that means the driveshaft is spinning faster. Most driveshafts are not rated for continuous operation above 3k RPM.

I would have been just as happy with 4.56 and 37s as I was 4.88.

troyoffroad

Are you sure you have an 8" lift? Don't know any company offering that much lift. Your pics don't look like that much either? I'd say 4.56 for 35's is perfect.

DTieu1

Yeah, It was built by Moab Industries. They say its a 8 inch lift.

urmyboyblue

So looks like you have Bushwacker fenders...so do I and I've got a 3.5" lift and the look is close...

On the gear note, just talked to my shop regarding my regear next week. I'm going 4.56's but they questioned this as they remembered I wanted to go 37's one day. However,that won't be for about a year so they said the 4.56's will be perfect for 35's and pretty good on 37's. I just don't want 3000+ rpms as I drive about 50-60 highway/day.

Short answer...I'm going 4.56s next week and I'll be going 37s in the future.

DTieu1

Yeah, I am probably just go with the 4.56. The chart said it'll be fine with 37's too.

WarPig512

I'd consult a reputable shop on this. Personally I went 4.88 with 35's and extremely pleased. I'm also not 100% on this but unless you're running more than a Dana 30 (and I believe you are at 3.21) you can't go more than 4.10. I believe the carrier won't support it. In my opinion 4.56 is only going to leave you wanting more unless you drive in relatively flat area. Any introduction to grade running a 4.56/37" is going to result in frequent downshifting, which is hard on the tranny and not to mention noisy. It also makes your JK thirsty. It's hard for most people to wrap their minds around running a higher ratio and actually getting better mileage but it's true. Do yourself a favor and don't go less than 4.88. Truth be told 5.13 is the more common gear to run 37's with.