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Unread 09-02-2013, 10:22 AM   #1
deftones07
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5.13's for DD?

Hey , just looking for opinions.

I am going to re-gear my 2011 JK 2 door auto. Have 3.73s and they are "OK" with my 33's, but certainely not the best lol.

My jeep has now become my daily driver since my old puddle skipper car blew up. I want to do 5.13's because i think ill re-gret 4.88's.

Just dont know if 5.13s will be too much for my DD. Getting 18-19 mpg with what i have now and would hope too keep it around the same so seeing what gears may be best.

thanks!

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Unread 09-02-2013, 10:28 AM   #2
JTPhoto
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Stay with what you have for 33", 5:13 will be overkill. Wait until you decide on 35 or 37" later to make a gear change.
I still run 3.73 in my 08 with 35" and it works fine for me.
If I were going to regear it would be 5.13 for 35" or 4.88 for 33".
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Unread 09-02-2013, 10:40 AM   #3
deftones07
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Yeah was worrying about it being too much. Ive just heard alot of people that went to 4.88s saying that it was a mistake and eventually went to 5.13s.

The 3.73s are alright i just wouldnt mind having a better response when i push the pedal.

Nice wheels by the way I run the same with duratracs. Trying to get a pic up but its giving me hard time uploading
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Unread 09-02-2013, 10:55 AM   #4
JTPhoto
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If you turn your OD off you will have better response. Have you reprogrammed?
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Unread 09-02-2013, 11:15 AM   #5
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I think that 4.88s would be best for you, also

5.13/5.38 is close to great for a non-DD and supreme for towing/off-road and towing freeway, but

If those situations are SELDOM--stick/w 4.88s-

5.38 is the best mod I've made to my JKUR, but it was and isn't a DD-

Forget the mileage, oh it'll go up if you regear to 4.88, but the cost of the regear far overshadows the slight increase in MPG-

Regear for your enjoyment, not for the gas mileage-

Good luck

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Unread 09-02-2013, 11:59 AM   #6
deftones07
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Yep i have the aev procal, and i usually have to turn OD off going up massive hills.

You think it will go up with 4.88s? Thats definately a bonus lol. Does 4.88s even feel like a huge difference from 3.73s? Doesnt seem like that big of a jump. I just think the 5.13s will be reving way to high doing 100km(60mph)+ on the highway.

4.88s may be the way to go. Anyone driving the auto with 4.88s?
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Unread 09-02-2013, 12:07 PM   #7
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There is an RPM chart on a past post 21-2300 rpm is the sweet spot on the 3.8. Also use the actual measured tire size you use to set your procal.
My 08 with A/T, 3.73 w/OD off runs the same final RPM (3rd gear)as 5.13 gears with OD on.
I tried to post the chart but the file size seems to be too big for this forum.
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Unread 09-02-2013, 12:19 PM   #8
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5.13's are great for a daily driver with an automatic, 3.8L and 35's (commonly sized as 315/70-17).

With 33's, 4.56 or 4.88 would be good, depending on your terrain, elevation, and usage.
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Unread 09-02-2013, 12:52 PM   #9
deftones07
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I notice you run 5.13s. What kind of mpg are you seeing?(only interested cause its my DD). When i buy my next tires im going to go 35's aswell. Just my duratracs are still like brand new and they have over 40 000kms lol So im going to have to drive them for a while still.

Driving on highway just fine? thanks!
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Unread 09-02-2013, 01:08 PM   #10
SubAtomicGenius
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Quote:
Originally Posted by deftones07 View Post
Yep i have the aev procal, and i usually have to turn OD off going up massive hills.

You think it will go up with 4.88s? Thats definately a bonus lol. Does 4.88s even feel like a huge difference from 3.73s? Doesnt seem like that big of a jump. I just think the 5.13s will be reving way to high doing 100km(60mph)+ on the highway.

4.88s may be the way to go. Anyone driving the auto with 4.88s?
2011 JKU w/ 4.88's and HEAVY 35's drives fine. You are talking about 130% deeper gear than 3.73's. IMHO, 5.13's would be best with 37's. Did the regear myself. However, IMHO, I would not go to 5.13's with a D30 axle assembly, the pinionn gear is waaaaaay too small and becomes the weak point of your whole assembly. The 4.88 pinion is already small enough!
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Unread 09-02-2013, 01:11 PM   #11
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Went 5.38s on my 2010 JKUR, automatic, 35s, daily driver. Disappointed with the power increase. 4:10 with OD off drove around town better than 5.38 with OD on. 4th gear ratio is just too high and it still feels like I'm lugging the engine and now my exhaust drones like crazy since I stay around 1500 RPMs. The only thing I felt like I got out of my regear was the reuse of OD on the freeway. City mpg stayed the same, haven't taken any out of town trips yet.
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Unread 09-02-2013, 02:10 PM   #12
brianjw
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Quote:
Originally Posted by TRAUMAhead
Went 5.38s on my 2010 JKUR, automatic, 35s, daily driver. Disappointed with the power increase. 4:10 with OD off drove around town better than 5.38 with OD on. 4th gear ratio is just too high and it still feels like I'm lugging the engine and now my exhaust drones like crazy since I stay around 1500 RPMs. The only thing I felt like I got out of my regear was the reuse of OD on the freeway. City mpg stayed the same, haven't taken any out of town trips yet.
Off road yet? Climbing mountain passes?

I think your opinion will change. I've regeared a couple rigs from 4.10 to 4.88 and 3.73 to 4.56, and around town it didn't make as big of an impact as I thought it would. But off road, towing, or climbing passes it made a huge difference. Much less downshifting and lugging.
Have you recalibrated for the gear change?
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Unread 09-02-2013, 02:13 PM   #13
deftones07
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Quote:
Originally Posted by JTPhoto View Post
There is an RPM chart on a past post 21-2300 rpm is the sweet spot on the 3.8. Also use the actual measured tire size you use to set your procal.
My 08 with A/T, 3.73 w/OD off runs the same final RPM (3rd gear)as 5.13 gears with OD on.
I tried to post the chart but the file size seems to be too big for this forum.
Yeah ive read that with OD off its just like 5.13s.

I find with my OD off withs 3.73s though im running very close to 3000rpms when doing around 100km(60mph) Which drastically drops my mpg. That said, its looking like 5.13s would just be too much for hwy driving. Once this is a dedicated trail rig maybe 5.13s, but by then might as well just go d44 with 5.38s.

Quote:
Originally Posted by SubAtomicGenius View Post
2011 JKU w/ 4.88's and HEAVY 35's drives fine. You are talking about 130% deeper gear than 3.73's. IMHO, 5.13's would be best with 37's. Did the regear myself. However, IMHO, I would not go to 5.13's with a D30 axle assembly, the pinionn gear is waaaaaay too small and becomes the weak point of your whole assembly. The 4.88 pinion is already small enough!
That is a very good point! But to be honest i havent heard of many pinions from a 5.13 in a d30 breaking... sure it happens though lol.

All that said, starting to lean towards the 4.88s
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Unread 09-02-2013, 02:27 PM   #14
mello
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I put 5:13 gears in my 2011 JKUR auto with 35's and it is not to much for highway driving. Have made a trip to Florida down I-65 from ky with my set up and was running in the 70-78 mph range.
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Unread 09-02-2013, 02:29 PM   #15
donny90yj
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I have 5.13's in my 07 2dr, 6 speed with 36's. Overkill for the street seeings how I don't have to and don't use 1st gear, just too low. Great for offroad though. Mpg's are about 14-15 city and 17-19 hwy depending on if I'm drafting. I'm at 3000 rpm at 74, and about 3200 at 80. I'd stick to the 3.73's with your 33's until you upgrade tires.
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