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Old 03-31-2012, 07:43 PM   #1
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Observations on re-gearing 3.73 to 5.13

It has been a week now since i changed to 5.13's and thought I would tell you what I think and feel about it.

The cost was just shy of $1500 out the door and used G2 gears and Master Install sets.

The price was my major problem, but after the slow off the start and time to highway speeds as well as running with OD off, I had enough.

The gears themselves are a lot smaller as in pinion shaft teeth. The contact on the ring is noticeably smaller. I don't do rock crawling anymore and don't think that would be a problem.

After picking it up from the installer, the first thing I did was set the gear size and tire size with my Procal.

Okay, the pedal is a lot easier or the Jeep responses quicker is my first observation. Wow, from a start it is back to normal as I think it should have been without the 35's.

Babied it for about 100 miles as the installer said and then whatever.

Boy has whatever changed...... I have to watch the pedal on dirt roads as a heavy one will spin the tires. That was impossible before.

Highway driving at 75 is great. Run about 2600 rpm and it doesn't hunt in OD. at all. It doesn't downshift with the cruise set unless there is a really good hill. (I live in Florida)

And, didn't know I had one, the ECO light is on almost all the time.

I am very happy.

Now, about the price.

I seem to be getting about 2-3 mpg better, computed not the liar in the Jeep.

With that it will take about 50,000 miles to get my money back at $4 a gallon.

Since I see my having this Jeep for over 100,000 miles, it looks good.

Now about that warranty from Jeep.........

Bottom line for me is this was worth it, but for others there are a lot of things to think about before you do it.

Thanks for listening......

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Old 03-31-2012, 07:58 PM   #2
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Great write-up, and it coincides with everything I've read about the pre-2012 auto trans JKs. Wildly undergeared straight from the factory. You put on 35s and you can forget about it. But the problem isn't the motor--it's the gears. Congrats!

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Old 03-31-2012, 10:08 PM   #3
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Quote:
Originally Posted by PapasJP
It has been a week now since i changed to 5.13's and thought I would tell you what I think and feel about it.

The cost was just shy of $1500 out the door and used G2 gears and Master Install sets.

The price was my major problem, but after the slow off the start and time to highway speeds as well as running with OD off, I had enough.

The gears themselves are a lot smaller as in pinion shaft teeth. The contact on the ring is noticeably smaller. I don't do rock crawling anymore and don't think that would be a problem.

After picking it up from the installer, the first thing I did was set the gear size and tire size with my Procal.

Okay, the pedal is a lot easier or the Jeep responses quicker is my first observation. Wow, from a start it is back to normal as I think it should have been without the 35's.

Babied it for about 100 miles as the installer said and then whatever.

Boy has whatever changed...... I have to watch the pedal on dirt roads as a heavy one will spin the tires. That was impossible before.

Highway driving at 75 is great. Run about 2600 rpm and it doesn't hunt in OD. at all. It doesn't downshift with the cruise set unless there is a really good hill. (I live in Florida)

And, didn't know I had one, the ECO light is on almost all the time.

I am very happy.

Now, about the price.

I seem to be getting about 2-3 mpg better, computed not the liar in the Jeep.

With that it will take about 50,000 miles to get my money back at $4 a gallon.

Since I see my having this Jeep for over 100,000 miles, it looks good.

Now about that warranty from Jeep.........

Bottom line for me is this was worth it, but for others there are a lot of things to think about before you do it.

Thanks for listening......
I think thats what im going to look into for my 2011 jku with the auto, sounds like youre happy with it. Tired of fighting the hills!! Thanks for the info!
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Old 03-31-2012, 11:35 PM   #4
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Quote:
Originally Posted by PapasJP View Post
.

Thanks for listening.....
.
Thanks for talking....

I like hearing success stories about regearing.
I'm just waiting on funding to regear my own.
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Old 03-31-2012, 11:35 PM   #5
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Glad you are happy with the gears. I noticed similar results with my 2011 Rubicon going from ~13.4 MPG back and forth to work to 15.1 over the last dozen tanks or so of fuel. I have gotten as good as 17 MPG on the interstate with the cruise set at about 67-68 MPH.

Performance has been greatly improved and I can actually run without having to turn my O/D off. Best mod for an automatic equiped JK in my book.

Manual trans equiped JKs will benefit as well but the autos came improperly geared from Jeep in my opinion.

Mike.
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Old 03-31-2012, 11:47 PM   #6
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Curse you all, just when I think I'm finally done I read this, now I have to have 35" and gears. I will leave banking info for donations to be forwarded to
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Old 04-01-2012, 08:19 AM   #7
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Quote:
Originally Posted by themoneypit
Curse you all, just when I think I'm finally done I read this, now I have to have 35" and gears. I will leave banking info for donations to be forwarded to
I have a Word doc with a list of mods I'm considering. No matter how many of the mods I actually install, the list only gets LONGER.
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Old 04-01-2012, 09:59 AM   #8
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Thanks for the informative post!
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Old 04-01-2012, 10:03 AM   #9
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mmm....gears.
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Old 04-01-2012, 10:51 AM   #10
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Quote:
Originally Posted by ESP
mmm....gears.






Lol
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Old 04-01-2012, 07:27 PM   #11
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glad to hear it worked well for you. I am debating on changing the gears from 4.10 to 5.13 but as of now, I am not going to a bigger tires (sticking with stock rubi tires/wheels). Will this be okay?

sorry for the highjack.
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Old 04-01-2012, 07:39 PM   #12
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Quote:
Originally Posted by nickmimi
glad to hear it worked well for you. I am debating on changing the gears from 4.10 to 5.13 but as of now, I am not going to a bigger tires (sticking with stock rubi tires/wheels). Will this be okay?

sorry for the highjack.
Yes, if you have a pre-2012 with an auto transmission. A number of folks here run 5.13s with that set up on stock tires. With a manual transmission though, that'll be too high.
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Old 01-29-2013, 04:35 PM   #13
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That's exactly my next project after reading this...i just put 35s and 3" lift on my 11 auto jk THIS WEEK and thought it was all done for awhile...smh.... how would 5.13 be towing a small trailer (M416)? it seems to be perfect on all aspects so far besides the $1500 ofcourse... What are the list of parts needed?
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Old 01-29-2013, 05:03 PM   #14
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I did 5.38's in my 2011 JKUR. auto w/ 3" lift 35's and some extra weight in front. It tachs 2650 @ 70mph. Averaging 16.5-17 mpg, sometimes a little better on highway. Best mod I've done! And It makes a good oportunity to put these purdy covers on. (I think they are worth about 10hp)
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Old 01-29-2013, 05:44 PM   #15
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Funny on this thread getting resurrected. I was just up here to poke around about regearing to make myself comfortable with a choice I made. Wife's JKU has been rolling on 35's with 3.21 gearing. I've been calling it drivable but we go back and forth on how drivable it is depending on where/how you are driving it.

Broke down yesterday and committed to having my local Indy 4x4 shop do a regear to 4.88 (manual trans) for her. Cost is coming in at just a few dollars shy of $2200 all in including tax.

I want to do mine as well (3.73 currently) but I'm going to hold off on committing to a ratio until I see how her 4.88 feels.

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