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Old 07-13-2011, 12:45 AM   #1
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question bout gearing

i have a 2011 jk sport 2dr. i recently put on 35" and i figured my gas mileage would decrease and it did. i went from 19.4 on highway to 17/16.5. i drive half an hour each way to work so mileage is important ( ya i know should have stayed with my stock 29" but they looked so bad) i talked to my dealer and he said they can redo the gearing on it to get me back to the original but it would run me 1700.00 bucks. wondering if this is way over priced or is this what it usually costs. he said it would take a day and a half. just wondering if the 2, 2+ mile gain is worth all the money? what do you guys think?

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Old 07-13-2011, 01:46 AM   #2
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Just for the derivability (huh???) I think it’s worth it. The norm seems to be 4.56 for the manuals and 5.13’s for the autos with 35-inch tires. I you shop around you should be able to get it done for less. Just make sure it’s an experienced shop concerning gear installs and that the shop is reasonably clean. That reflects on the quality of workmanship for the most part.

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Old 07-13-2011, 05:45 AM   #3
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Always tell us what transmission you run when asking these type of questions. It is a must so an informed answer can be given. Current gears would be nice also.

Well, I have to say that you will get better performance with regearing but hwy gas mileage will not increase at all. I saw a little increase in city mileage but not a whole lot. If all you lost in gas mileage is 2 to 3 mpg's going to 35's you should feel lucky. Many lose a lot more then that, especially with those heavy grapplers.

But back to gears, they cost me $1500.00 for Yukon's. If you can get them they are the best. It is best to shop around but a great shop that does gears a lot is more important IMO. Not sure the dealer is the best though. They may be good but really how many gears do they install? A good off road shop or someplace that specializes in gear work might be better. You can get cheaper by buying your gears yourself, but the $100 you save wasn't worth it to me because if something is wrong then you have to work it out. If the shop gets the gears then they take care of everything including warranty issue. Which goes back to it is more important to get a good shop then price too because new gears means if there is an issue then Jeep no longer will take care of it and the issue falls back to the installer and the gear manufacture.

As far as gas mileage, I got a little less then 1 mpg in city back but saw no increase on hwy mileage. Did see a little more while breaking in the new gears but after settling back in to old driving habits that was it. Seen more MPG gains from Superchips Flashpaq then gears. But saying that, the gears were well worth the money just in how well it preformed. It was nice to be able to drive in overdrive again and the get up and go was better then stock by far.
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Old 07-13-2011, 06:32 AM   #4
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If you live in Tx, 1000.00 for a re-gear is the going price.....the other two posters pretty much covered everything..

I have 35's and regeared to 5:13's with a auto tranny /with a superchip and on a good day I can get 18mpg..
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Old 07-13-2011, 07:27 AM   #5
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$1700 is about 500 gallons of gas, which is roughly 10,000 miles on the road, decreased by about 15% you've lost in your 35s.

Do the math with a calculator if you want closer estimate.

Your rig, your bank account. We all have differing ideas about what serves us best.

Personally, I'm concerned whether my own proposed tire change to heavier tires and deeper lugged 32s will decrease my excellent MPG.

DD needs are different; if you plan on doing Moab or the mall, spending $1300 on tires and then $1700 on gears to get back to where we were means a lot of extra overtime.
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Old 07-13-2011, 08:01 AM   #6
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you are getting way better miles per gal the me. i am getting like 9-10 miles per gal, my last tank i only got 178 miles witch sucks but i only have 785 miles on the jeep. i have 35s also and i am going to regear but am thinking of putting in 4.88 its an auto. the price for me to regear is like $ 1600 so i dont know what i am going to do.
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Old 07-13-2011, 08:25 AM   #7
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I swapped gears in my JKUR and drove like my grandma-during the breakin and logged better than 3 mpg increase on the freeway, now it's back to 17 mpg avg-

It's just QUICK money, with a LONGTERM benefit !!

Good luck

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Old 07-13-2011, 09:22 AM   #8
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Would be nice to know which gears you currently have. Handshaker or Auto. If you have the popular 3.21's & an auto, I'd think you would destroy your tranny eventually. 3.21's & a stick & your clutch is going to get a terrible workout. Not to mention the fact that you will have to "race" over obstacles in 4 low. Also, figuring MPG's is tough if you haven't recalibrated or use a GPS to do so. Everything is wack now.

I'd do the re-gear ASAP or buy shorter tires.

Mine: 07 X, 6 speed, 5.13's, 35x12.5x18's, 69 mph @ 2800 rpm's. (GPS calculated) Crawls like a newborn, (slow) Often 14 mpg, never better.

Good Luck!!!
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Old 07-13-2011, 10:22 AM   #9
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I was trying to figure this out myself I have a rustys 3.25 inch lift and I'm buying 35 inch tires on a 3.8 6 speed what gears should I look into getting. I've also heard this isn't an easy job to just do yourself I do all the work I can on my jeep myself but I heard there are spacers involved and it has to be pretty precise
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Old 07-13-2011, 10:33 AM   #10
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^^^Most go with 4.56 gears with 35’s and the 6 speed. Changing gears is almost an art and you’ll need some specialty tools too. If you have to ask then by all means have a shop do it. Done wrong will be disastrous.
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Old 07-13-2011, 10:33 AM   #11
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Quote:
Originally Posted by Sixgun4559 View Post
I was trying to figure this out myself I have a rustys 3.25 inch lift and I'm buying 35 inch tires on a 3.8 6 speed what gears should I look into getting. I've also heard this isn't an easy job to just do yourself I do all the work I can on my jeep myself but I heard there are spacers involved and it has to be pretty precise
If it's you DD & you want to go faster than 70 mph, I'd go with 4.56's. If you're OK with 70 as a top cruising speed, then I would go with the 5.13's. That's just me. I have had her up to 80 when climbing hills on the freeway, but that's just cause I gouged her good at the bottom & wanted to see what she could do. (yes, 80 mph, UPHILL in my Jeep, in 6th gear!!) Loven my 5.13's

With stock gearing the only way my jeep would go 80 mph up hill was on a trailer, lol.
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Old 07-13-2011, 10:43 AM   #12
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re: "69 mph @ 2800 rpm's."
This is a great data point. My stock auto/3.73 runs 69mph about a thousand rpm less....which for my needs is fine. If I hit too much lag in a longish mountain upgrade, I can switch off OD or manually drop down a gear.

Jimbox seems to have hit the sweet spot for great performance both on and off road.

Years ago my 54 Willys Overland had a monster rear end ratio, 5.89 IIRC with the stock 3 speed and a small Ford 6. It would climb a tree but road top speed was barely 50mph and it got horrid gas mileage.l On backwoods fire trails and logging roads it was truly at home for perfect low speed crawl when needed, but hitting the freeway headed for town it really needed another couple higher gears.
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Old 07-13-2011, 10:57 AM   #13
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Heh Heh, thanx JJ, my 5.38s rack about 2250rpm, (O/D) at 60 mph and will produce almost 19 mpg, but it's kinda hard to drive 60mph on todays freeways-at 70 mph, she's racking about 2600rpm and 17 mpg--


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Originally Posted by JeeperJake View Post
re: "69 mph @ 2800 rpm's."
This is a great data point. My stock auto/3.73 runs 69mph about a thousand rpm less....which for my needs is fine. If I hit too much lag in a longish mountain upgrade, I can switch off OD or manually drop down a gear.

Jimbox seems to have hit the sweet spot for great performance both on and off road.

Years ago my 54 Willys Overland had a monster rear end ratio, 5.89 IIRC with the stock 3 speed and a small Ford 6. It would climb a tree but road top speed was barely 50mph and it got horrid gas mileage.l On backwoods fire trails and logging roads it was truly at home for perfect low speed crawl when needed, but hitting the freeway headed for town it really needed another couple higher gears.
Luckily-I'm not on the freeway too much and off-road is a dream !

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Old 07-13-2011, 11:01 AM   #14
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Originally Posted by Sixgun4559 View Post
I was trying to figure this out myself I have a rustys 3.25 inch lift and I'm buying 35 inch tires on a 3.8 6 speed what gears should I look into getting. I've also heard this isn't an easy job to just do yourself I do all the work I can on my jeep myself but I heard there are spacers involved and it has to be pretty precise
4.56 would be optimum gear range but unfortunately, most good gear companies don't either carry them for a non-rubi JK or never have them in stock for some reason. I originally wanted 4.56 myself and just couldn't get them in any quality gear set. Even 4.10's are pretty hard to get. I went with 4.88 for my Auto and now wish I went to 5.13's. I think for a dd the 4.88 will push the limited for a manual but may be your only option. But if you tow or do a lot of off roading then you will love the 4.88's
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Old 07-13-2011, 11:45 AM   #15
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Quote:
Originally Posted by 07XMan2Door

If it's you DD & you want to go faster than 70 mph, I'd go with 4.56's. If you're OK with 70 as a top cruising speed, then I would go with the 5.13's. That's just me. I have had her up to 80 when climbing hills on the freeway, but that's just cause I gouged her good at the bottom & wanted to see what she could do. (yes, 80 mph, UPHILL in my Jeep, in 6th gear!!) Loven my 5.13's

With stock gearing the only way my jeep would go 80 mph up hill was on a trailer, lol.
Ok cool so what would be the top speed if I went with the 4.56 gears because right now I can't go about 90 at least that's the fastest I've gone. Will it basically be the same with the 4.56 gears then?
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Old 07-13-2011, 11:50 AM   #16
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You can't get 4.56 in good gears.
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Old 07-13-2011, 11:53 AM   #17
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Originally Posted by Sixgun4559 View Post
Ok cool so what would be the top speed if I went with the 4.56 gears because right now I can't go about 90 at least that's the fastest I've gone. Will it basically be the same with the 4.56 gears then?
Review this chart if you haven't already. Wth 35s and a six speed on a daily driver, I'd probably do 4.88s truthfully. Though 4.56 wouldn't be a bad idea either. 5.13s would be pushing it for someone who spends time on the highway.

As to the extent top speed will be limited by RPM, look at it this way. If you get 4.56s you'll be spinning about 2500 RPM at 70 mph. If you had a stock Rubi (4.10 gears) on stock tires, you'd also be spinning about 2500 RPM at 70 mph. So what's the top speed of a stock Rubi? I dunno--but fast enough.

4.88s would only add another 200 or 300 RPM. Not really a big deal. 5.13s add another 150 or so on top of that, getting you close to 3000 RPM just to stay at 70 mph in 6th gear. That's getting a little high for my taste.

Finally, keep in mind with all this that once you go to above 4.56, you really can't ever use stock size tires again without undoing your regearing. Even the 4.56s would be pushing it. That should be obvious, but I've often wondered how many folks see their gas bills climbing from the 35s and consider maybe moving back to 33s or just fatter 32s, only to realize that's no longer an option with their 5.13s etc.
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Old 07-13-2011, 11:55 AM   #18
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Thats everso true and thats because-----


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You can't get 4.56 in good gears.
If you're paying for a regear ($1000/1700), 4.56 is WORTHLESS, for the 6spd/auto--

---MINIMUN= 4.88 or ideally 5.13-5.38 for auto-then your free for a multiple tire size changes--with good mileage/responce/APPLIED POWER--

Simple logic !!

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Old 07-13-2011, 12:05 PM   #19
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If you're paying for a regear ($1000/1700), 4.56 is WORTHLESS, for the 6spd/auto--
Nah, come on--4.56s are perfect for a 6 speed on 33" tires!

For 35s though, they'd really just be "replicating" what comes stock in the Rubi. And if you're going to be paying all that money, why just shoot for stock level performance? So I agree and would go 4.88 for a DD.
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Old 07-13-2011, 12:12 PM   #20
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Layers ! if I say don't doit--


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Nah, come on--4.56s are perfect for a 6 speed on 33" tires!

For 35s though, they'd really just be "replicating" what comes stock in the Rubi. And if you're going to be paying all that money, why just shoot for stock level? So I agree and would go 4.88 for a DD.
You'll write a 4 hr dissertation on the pros/cons/of the action and then give legal examples all the way back to 1936, the case of XXX-vs-xxx


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Old 07-13-2011, 12:59 PM   #21
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Layers ! if I say don't doit--

You'll write a 4 hr dissertation on the pros/cons/of the action and then give legal examples all the way back to 1936, the case of XXX-vs-xxx
Exactly! Got to keep you honest (us lawyers are GREAT with honesty, after all).

Truly though, I guess the point is there is really only ONE type of Wrangler owner that benefits from 4.56s--6 spd with 33s. Beyond that, they're imperfect fits. Which no doubt explains your and Rick's observation that gear companies don't make a lot of 4.56s.
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Old 07-13-2011, 01:17 PM   #22
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Heh Heh, yea, I've read of guys that have 3.21 gears/6spd trannys and are running 35" tires, but WHY regear-they're happy-


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Exactly! Got to keep you honest (us lawyers are GREAT with honesty, after all).

Truly though, I guess the point is there is really only ONE type of Wrangler owner that benefits from 4.56s--6 spd with 33s. Beyond that, they're imperfect fits. Which no doubt explains your and Rick's observation that gear companies don't make a lot of 4.56s.
What they don't say is that they operate in 3rd/4th gears and seldom see 5th-or O/D 6th--I guess it's all personal !!

Smokemifyougotem

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