5.13 on 6spd with 35s - JKowners.com : Jeep Wrangler JK Forum
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post #1 of 62 Old 10-21-2011, 10:48 AM Thread Starter
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5.13 on 6spd with 35s

I have a 6 speed 11 JKUR or course with 4.10 gearing. I know Ive looked at a ton one gearing threads.

If I have 35s right now and I decide to re-gear to 5.13s will that be miserable until I go to 37s? I mean the 4.10 is tolerable but not optimum to off road with.

Highway speeds will I be reving to high?

what say you?

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post #2 of 62 Old 10-21-2011, 11:00 AM
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Stigo ran around with 5.13s and 285s for a few weeks. It's not horrible, but you'll be turning a few RPMs. I almost think 5.13s are too high for 37s and a 6 speed but he likes it.


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post #3 of 62 Old 10-21-2011, 11:03 AM Thread Starter
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So maybe I should wait to regear til my 35s have to be replaced?

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post #4 of 62 Old 10-21-2011, 11:05 AM
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So maybe I should wait to regear til my 35s have to be replaced?
How happy are you with the way the JK performs right now?

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post #5 of 62 Old 10-21-2011, 11:10 AM Thread Starter
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Yeah yeah I know leave it along with what I have, there certainly isnt anything wrong with my current setup for what I do....

And I dont live in the mountains where if you are not sporting 40s you are shunned.

Ive never had 37s before

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post #6 of 62 Old 10-21-2011, 11:15 AM
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Ha ha! If I was still on 35s I'd leave the 3.73s until I upgraded the entire axles.

If you're happy with it's performance put that gear swap money into something like skids, rails, or even axle shafts.

Marcus


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post #7 of 62 Old 10-21-2011, 11:21 AM Thread Starter
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Good point, til I make it so heavy I need to regear!

Thanks bro

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post #8 of 62 Old 10-21-2011, 12:05 PM
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I ran 5.13's and 35's for over a year.

3,000rpm @ 71mph

I got 15mpg or so "around town" and 12-13 on the highway.

It's liveable, but it's geared really deep.


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post #9 of 62 Old 10-21-2011, 12:27 PM
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I've run 5.13s on 35" KM2s with a 6 peed for about 2 years now and I love it. It's perfect for the kind of wheeling I do, and I found the ratio makes up for my 2.72 T case. On the highway, I very rarely get the jeep over 70 mph, so its not big deal. I mean I've done 80 with it with this set up and even then it didn't feel overgeared.

I went with 5.13s because I plan to upsize tires in the future. I'm thinking 38s or 39.5s...then the gearing should be spot on.

And if you're worried about mpg, the jeep is the wrong vehicle. I think I average about 15 mpg, but I try not to pay attention to it.

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post #10 of 62 Old 10-21-2011, 12:31 PM
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I ran 4.10's with 32's for several months. There is a RPM difference but it isn't that bad and I maybe lost 1/2MPG. You start to ignore 1st

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post #11 of 62 Old 10-21-2011, 01:01 PM
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I have been interested in this as well.

I would find it helpful some guys could throw up actual RPMs at highway speeds like jeeperjkj

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post #12 of 62 Old 10-21-2011, 02:04 PM
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I've got 5.13s and 315/75R16 ProComp Xtreme All-terrains.

Same RPMs at 70 as jeeperjkj, but little better mileage.

I dig it off-road, but I do a lot of shifting around town and almost never use 1st.

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post #13 of 62 Old 10-21-2011, 02:20 PM
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Originally Posted by Joneszj View Post
I've run 5.13s on 35" KM2s with a 6 peed for about 2 years now and I love it. It's perfect for the kind of wheeling ...... On the highway, I very rarely get the jeep over 70 mph, so its not big deal. I mean I've done 80 with it with this set up and even then it didn't feel overgeared.

I went with 5.13s because I plan to upsize tires in the future. I'm thinking 38s or 39.5s...then the gearing should be spot on.

And if you're worried about mpg, the jeep is the wrong vehicle. I think I average about 15 mpg, but I try not to pay attention to it.
X2. I would not go a different route. I like the gearing and all 6 gears are usable now. I have no idea how people like to start off in 2nd gear. I need to use first in high range.

If you go with 5.13s the only draw back will be slightly less fuel milage at high speeds. If i keep it around 60 I can get 18mph.

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post #14 of 62 Old 10-21-2011, 02:48 PM
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If i keep it around 60 I can get 18mph.
They'll mow you over going that fast around here!

As much as I'd kinda like to swap my 4.10s out, the 75-80mph cruise is right at a sweet rpm for the 3.8L. I've been babying it the last two days, the display reads 18mpg. So probably 16-17mpg average.What sucks around here is it's all "get up to 50mph"....."red light". Hurry up and STOP.

With 37s I don't think I'd personally go past 4.88s. While it's the same money to go with a deeper gear, I prefer the lower cruise rpm and will give up a little crawl ratio.

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post #15 of 62 Old 10-21-2011, 05:47 PM
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They'll mow you over going that fast around here!

As much as I'd kinda like to swap my 4.10s out, the 75-80mph cruise is right at a sweet rpm for the 3.8L. I've been babying it the last two days, the display reads 18mpg. So probably 16-17mpg average.What sucks around here is it's all "get up to 50mph"....."red light". Hurry up and STOP.

With 37s I don't think I'd personally go past 4.88s. While it's the same money to go with a deeper gear, I prefer the lower cruise rpm and will give up a little crawl ratio.
This is probably the most level headed and well organized statement I have ever seen in a gearing thread.

Well except for planman with all of his crazy calculations for altitude, tire size, hill grade and all that crazy stuff.

A lot of people don't take location into consideration when changing gears.

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post #16 of 62 Old 10-21-2011, 06:04 PM
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This is probably the most level headed and well organized statement I have ever seen in a gearing thread.

Well except for planman with all of his crazy calculations for altitude, tire size, hill grade and all that crazy stuff.

A lot of people don't take location into consideration when changing gears.
Thanks for the compliment, to elaborate I don't see the desire in gearing a 6spd like an automatic. The 6speed has a 4.46:1 1st gear, where-as the automatic has a 2.84:1 (not including what the torque converter will do for it). Anyway the automatic also has a higher final drive gear of .69:1 where-as the 6spd has a .84:1.

Basically the manual has a lower (better crawl) first gear, and a higher geared/revving 6th gear compared to the automatic. If you gear it to what it takes to make an automatic "acceptable" you'll end up rowing like a fool at every stop light and a high cruise rpm. The half of the beauty of a manual is you can pick a gear and hold it. I much prefer to drop it in 5th to pull a hill and get my lower flat-land rpm back when I want it. Gear down too low and you'll be able to pull whatever hill you want in 6th...but just rev away for no reason on everything else.

For some reason I see the perception that if you have to down-shift at cruising speed you aren't geared enough. Not in my opinion, we all suffer from the same lack of torque...but utilizing that shifter gives you a wide spread of rpm choices.

Just my observations, I think 4.88 is as deep as I'd go with a manual. Unless I was dead set on some 40s or something.

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post #17 of 62 Old 10-21-2011, 06:31 PM
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I am wondering about gearing as well. I have a 6sp with 35s. Will eventually run 37s but I also plan on towing a 3500lbs trailer. I live in bc where there are lots of hills. This is also a dd. so what gearing will be best?
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post #18 of 62 Old 10-21-2011, 06:35 PM Thread Starter
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That's pretty interesting. Thanks for that observation. I'm still leaning towards staying at 35 s and 4.10

Btw how would 35 s run with the 4.88?

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post #19 of 62 Old 10-21-2011, 07:03 PM
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4.88s and 37s @ 75 about 26-27k if I remember correctly w/ 6 spd. I had 4.88s with 33s and it was too deep, i get the same if not better gas milage w/ 37s, 15-16 around town, 16-18 on highway (18 at 70 at one point). I run superchips 87 tune.

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post #20 of 62 Old 10-21-2011, 07:14 PM
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6 speed; 5.13; 35s for approximately 15,000 miles with no complaints. 1st is a bit short and the RPMs over 65 are high, but nothing major. Switched to 37s a couple months ago ...I think the combination is perfect now.

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post #21 of 62 Old 10-21-2011, 07:26 PM
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Quote:
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That's pretty interesting. Thanks for that observation. I'm still leaning towards staying at 35 s and 4.10

Btw how would 35 s run with the 4.88?
A member that lives near me is running 4.88s with 35s with a 6speed. He claims that the cruise rpm is just a tad too high for his liking and that either 4.56 with 35s or 37s with 4.88s would be ideal for him.

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post #22 of 62 Old 10-21-2011, 07:27 PM
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post #23 of 62 Old 10-21-2011, 07:53 PM
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This is probably the most level headed and well organized statement I have ever seen in a gearing thread.

Well except for planman with all of his crazy calculations for altitude, tire size, hill grade and all that crazy stuff.

A lot of people don't take location into consideration when changing gears.
I agree with your last statement. It matters greatly where you live and how you drive. There is nothing crazy about calculations for altitude, tire size. I live over 5,000 ft and travel to around 10,000 often. If I lived in DFW (which I will never do again) 5.13 and 35s would not do for the highway speeds and fuel milage. However, for me 5.13s actually improved milage.

With 5.13s I still have to gear down to 4th often for hills. This summer when I had the whole family in the jeep along with pulling my trailer I was thinking lower gears would have been nice. Actually, this is the only thing stoping me from going to 37s.

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post #24 of 62 Old 10-21-2011, 07:58 PM
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I run a six speed, 37's and 4.88's. I am in Iowa flatlanding probably much like the OP in Ohio. I had 35's and 3.73's before. Have been to CO and UT 3 times with this set up and it is about perfect. The 4.88's crawl pretty good (non-rubi also), get me through the mountains ok, but are great for the 95% of the driving I do back home in Iowa.

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post #25 of 62 Old 10-23-2011, 05:25 PM
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I am running 4.10's with 35 Micky MTZ (manual), on the highway the gearing feels good, I am running the Superchip tune for the higher octane, but also I have a softop and half doors, so weight wise I am a lot lighter then other guys. I think that weight plays a very big factor when re-gearing.

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