What gears would you recommend for 35's? - JKowners.com : Jeep Wrangler JK Forum
 
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post #1 of 25 Old 07-06-2010, 07:11 AM Thread Starter
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What gears would you recommend for 35's?

2010 Unlimited (automatic transmission), doing a lift and 35's next week... what gear ratio is recommended? I've used the calculators, but the numbers don't tell me much in regard to actual driveability so I'm looking for some people who have already done it on an automatic.

What did you go with, and what did you WISH you went with? Basically looking to keep on-road performance as close to "factory" as possible in spite of the bigger tires. Still want to leave overdrive on and all that.
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post #2 of 25 Old 07-06-2010, 07:18 AM
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I went with 5.13's and couldn't be happier!


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post #3 of 25 Old 07-06-2010, 07:35 AM
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By a significant margin folks seem to prefer 5.13s over 4.88s, some even jumping all the way to 5.38s. The JK's lack of torque favors shorter gears, but the concern with the Dana 44 becomes the small pinion gear. We get reports of shredded pinion teeth from time to time. Going to depend how you use it and whether you have a manual or automatic.
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post #4 of 25 Old 07-06-2010, 07:59 AM
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My wife has an automatic 4 door.

From our personal experience, you want to go as low as possible--5.13s for a non-Rubi or 5.38s for a Rubi.

The lower the gear with an automatic, the better your performance and better your gas mileage due to reduced downshifting at highway speeds.


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post #5 of 25 Old 07-06-2010, 09:16 AM
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another vote for 5.13

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post #6 of 25 Old 07-06-2010, 09:55 AM
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I have driven the auto with 5.13 and that is on my list when I change gears.
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post #7 of 25 Old 07-06-2010, 03:10 PM
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I just put 5.13's in and it runs great. Good thing the gears were used and didn't reset well so I'mgoing 5.38's even better

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post #8 of 25 Old 07-08-2010, 07:04 AM Thread Starter
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Sounds like the consensus is 5.13's then... anyone have a good place to buy? One of the local Jeep shops told me $1,800 installed which seems really high, they said everything is more expensive for a JK. Haven't done a gear swap in about 12 years but I can't imagine things have changed that much where I couldn't do it myself.
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post #9 of 25 Old 07-08-2010, 07:33 AM
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Well the consensus isn't 5.13s, because I went with 5.38s with my auto trans Rubi that is going to be on 35s. And the price for your gear install is double what it should be. The shop that is doing mine right now is charging me $900 for the gears and installation. They are doing a fair amount of other work at the same time though, including a Dynatrac Pro Rock 44 front axle and a Teraflex LCG long arm suspension install. Maybe they are making some more money on the other labor, ... but their prices for that work have been just as good. I should get the Jeep back tomorrow, the suspence is killing me.

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post #10 of 25 Old 07-08-2010, 08:02 AM
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I have been running for 3 years now with 4.10's and 35's. If you have lower then 4.10's and need to upgrade any way, then I would go with the 5.13's. If you do have 4.10's I personally would just stick with 4.10's for now until you have to go to 5.38's.

Just my .02

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post #11 of 25 Old 07-08-2010, 07:56 PM
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I have an 08 rubi unlimited with auto and 4.10s running stock tires and rims (for the next mont or two), Best man bought a 2010 rubi unlimted with auto (same color too) and upgraded to 35s with 5.13s and a teraflex 3". It drives like stock. He lives in colorado and I live in Jersey. If you are doing steep inclines frequently I would not go lower than 5.13s. Im running flats here in jersey, but Im still going with 5.13s when I step up.

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post #12 of 25 Old 08-08-2010, 07:42 PM Thread Starter
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Still trying to wrap my head around all of these suggestions ... is there any reason not to go to 5.38's? This is not a Rubicon, just a reg. 4 door w/automatic tranny & 35's. I have the AEV ProCal already.

Can you even go that high on a non-rubi or is 5.13 the max?
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post #13 of 25 Old 08-08-2010, 08:17 PM
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Handy chart. And yeah, add jme to the 5.13 vote count.


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post #14 of 25 Old 08-08-2010, 08:22 PM
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From what i've seen and heard from others 5.13s is whats your looking for, most other guys running your set up like the 5.13s in non-rubi auto's. i've got a 2dr w/6 speed so i have no personal xp with the auto's. just my $.02

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post #15 of 25 Old 08-08-2010, 08:56 PM
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i have 4.10's and 35's on my wife's auto 2 door... i ordered 5.13's... i just hope i'll be able to see mpg numbers CLOSE to this afterward...

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post #16 of 25 Old 08-08-2010, 09:38 PM
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5.13's are on my short list as soon as I can afford the gears + install costs.

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post #17 of 25 Old 08-28-2010, 07:18 AM Thread Starter
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Got my 5.13's and a detroit locker is on the way - when it's all here it's all going in at once. I already have the AEV ProCal, so I'll be able to adjust for the gears instantly & report my results.
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post #18 of 25 Old 08-28-2010, 07:47 AM
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I have a 2 door Sport, D44 in the back, D30 up front... using Spartan Lockers. I can not speak for 35's yet, for all I have are 33 inch tall tires. But, mine is an automatic, and once I put the Gobi Stealth Rack on top, it was like adding a parachute.

I upgraded to 4.88:1 because I am in Florida, and I do a crap load of highway driving. I bought my Jeep March 21'st and it already has over 17k miles on it.

The difference between 3.73 and 4.88 are NIGHT AND DAY. I can't begin to tell you how different it drives and feels. It is like I gained 100 cubic inches... and the converter stays locked. I can actually accellerate while in overdrive! Even with the roof rack.

Now, what would the difference betwen my gears and a 5.13? I can't say. But, my jeep has tons more "feel" to it now, than when it did factory, with the little donuts on it. So, I'm confident I could ride on 35's with no issues.

I was concerned on the small pinion in a D30 so I went with a 4.88. It was my choice, and I don't regret it.

Oh, I'm also in Florida, so it's really flat. I don't tow either... so, that's something to consider.

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post #19 of 25 Old 08-28-2010, 09:05 AM
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5.13's


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post #20 of 25 Old 08-28-2010, 09:12 AM
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5.13 is as low as you can go on the X/Sahara so go for it. I've got a 6spd on 5.13's and love it. Your rpms will be a bit lower, but for 35's it'll be just fine. I wanted the 5.13's 'cause I plan on putting 38's on soon. I think the rpms will be perfect with the 6spd, 5.13's, and 38's. I'm just gonna start wantin' a Klune/Blackbox/Atlas after I do that tire size increase. It never ends.


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post #21 of 25 Old 09-11-2010, 02:21 PM Thread Starter
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Finally got my 5.13's in - definitely worth it for anyone still on the fence. This is how it should have been from the factory, the starts from a stop aren't as sluggish and highway driving is fine - I can run 70-80 MPH with overdrive on without the engine going crazy. I think 70 MPH was around 2,200 - 2,300 RPM's with overdrive on.
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post #22 of 25 Old 09-11-2010, 05:50 PM
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5.38s here and walked through EJS trails (cliffhanger, poison spider, etc.) and Rubicon this year getting 3-4+ mpg over buddy with same rig and 5.13s due to holding Overdrive longer driving out and back.

Food for thought...

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post #23 of 25 Old 09-11-2010, 06:07 PM Thread Starter
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Originally Posted by here4fun View Post
5.38s here and walked through EJS trails (cliffhanger, poison spider, etc.) and Rubicon this year getting 3-4+ mpg over buddy with same rig and 5.13s due to holding Overdrive longer driving out and back.

Food for thought...
If I had a dana 44 front end I'd have gone 5.38's too, but for now it's 5.13's & no locker in the D30.
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post #24 of 25 Old 09-17-2010, 05:54 AM
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Gears, baby...

So it looks to me like most folks are preferring 5.38's, possibly 60/40 over 5.13's. Does that answer change any with a Hemi swap? I would think the 5.13's (or maybe 4.88's?) would win out in that case...?

Can someone who has driven a Hemi swap on 35's comment on their driving impression of their gears?

<no thread hijack intended>
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post #25 of 25 Old 09-17-2010, 08:26 AM
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Quote:
Originally Posted by Jeep2.0 View Post
So it looks to me like most folks are preferring 5.38's, possibly 60/40 over 5.13's. Does that answer change any with a Hemi swap? I would think the 5.13's (or maybe 4.88's?) would win out in that case...?

Can someone who has driven a Hemi swap on 35's comment on their driving impression of their gears?

<no thread hijack intended>

it really depends on the axle as how steep you can go. 5:13 for the Dana 30 and the Rubi guys can have 5:38's 5:13 are fine for 35's,

if you wanna go with bigger tire in the future than do 5:38. remember to truss and support those weak axle tubes.
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