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Old 03-11-2011, 08:15 AM   #1
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Smile Re-Gear

Hey everyone, wanted to get some feedback on a re-gear from 3.73 to 5.13.....heres my set up:
2010 Jk 4 door-3" Zone lift-315/70/17 Duratracs[35'S]-just ordered the 5.13 set up from Allens Offroad.Wanted to know the Pros/Cons on this set-up,hopefully not too many Cons,if any.
Example:Gas mileage
Trans shifting-automatic
Freeway cruising..etc.....

Any other thoughts or comments are welcome,
Thanks for your time,Dean

p.s. Allen at A.O.R. was great to work with.very patient guy.
Thanks also to the guys at Zone Offroad

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Old 03-11-2011, 09:49 AM   #2
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I'm sure you know the Pro's already, better gas mileage, better acceleration, more power, etc.

Con's are price but to me the major con of deeper gears is also a pro, the power. The ring and pinion will be easier to break, so take it easy on the gas. It'll be a bit easier to mess up axle shafts, u-joints, etc. with the deeper gears.

Your mileage won't be as good as stock, but with 35's, an auto, and 5.13's you should be close enough.

It won't fix your speedometer. That means your trans still might shift funny as it computes RPM, speed, throttle placement, and a bunch of other stuff and computes it in a way humans can't understand. Programmers will correct it though.

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Old 03-11-2011, 09:52 AM   #3
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To me 5.13's are way too low in a jeep with that small of tires....the gearsets are weaker because the pinion is so small.
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Old 03-11-2011, 10:06 AM   #4
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I'd call those 35's. With an automatic JK, many use the 5.13 gear set as the standard for that size with 4.88 for manuals. Makes up for the sh*tty engine I guess

I'm running 4.11 on an auto with 35's chipped and she's good, but that's me.
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Old 03-11-2011, 11:18 AM   #5
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To me 5.13's are way too low in a jeep with that small of tires....the gearsets are weaker because the pinion is so small.
And you don't know what you're talking about either. The auto trans JK is geared way too tall for highway use in stock form, so it needs a drastic re-gearing to get it even close to where it should be. Not only are 5.13 gears not too deep of a gear, they are not deep enough. 5.38s are a better choice for 35" tires, and not deep enough for 37" tires. He doesn't appear to have a Rubicon though, so 5.13 gears are the best he can get. Dean, your plans sound good.
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Old 03-11-2011, 11:35 AM   #6
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And you don't know what you're talking about either. The auto trans JK is geared way too tall for highway use in stock form, so it needs a drastic re-gearing to get it even close to where it should be. Not only are 5.13 gears not too deep of a gear, they are not deep enough. 5.38s are a better choice for 35" tires, and not deep enough for 37" tires. He doesn't appear to have a Rubicon though, so 5.13 gears are the best he can get. Dean, your plans sound good.
Agreed. The 5.38s are for a D44; best you can do in with a D30 is 5.13
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Old 03-11-2011, 02:16 PM   #7
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And you don't know what you're talking about either. The auto trans JK is geared way too tall for highway use in stock form, so it needs a drastic re-gearing to get it even close to where it should be. Not only are 5.13 gears not too deep of a gear, they are not deep enough. 5.38s are a better choice for 35" tires, and not deep enough for 37" tires. He doesn't appear to have a Rubicon though, so 5.13 gears are the best he can get. Dean, your plans sound good.
Is that right? You do realize there are people who have run that low of a gear long before a jk right? Only a person with no knowledge whatsoever would argue the strength of a 5.13 over anything taller. So tell me what the purpose is of trying to make it a racecar on the street, but when you pull the short stick, its way too low offroad.....and yes, you can be too low boys. The 42RLE that I think your refering to has a lowgear of 2.84....now, both standard ford and gm autos are far higher than that...a ford C6 is 2.46 and a TH350 is 2.52...hell even the 904 and 727 dodge trannys are not as low as your JK one. My point is final drive with a 35 inch tire and lets say a 4.10 gear your already lower and should have more get up and go than a jeep with a 904 in it and the same gears and tires. You cant blame it on the tranny or the jeep being geared too tall....the facts don't support your claim at all
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Old 03-11-2011, 03:46 PM   #8
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You're missing the boat entirely, or at least you're on the wrong end of the boat. We're not talking low gear ratio with the auto trans, we're talking overdrive ratio, which is way too tall at 0.69. Low gear ratio doesn't even need to be part of the discussion for what the OP is doing.

Show me one single person that has a four door JK with 35s, an auto trans, and 5.13 gears, that thinks that gear ratio is "way too low", as you claim.

How many actual people can you name that have broken a pinion gear on an auto trans four door JK with 5.13 gears and 35" tires? You're giving bad advise based on hypothetical concerns about pinion gear size. And you're not giving good advise about proper gear ratio based on actual ownership of a four door JK with his set up.
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Old 03-11-2011, 04:30 PM   #9
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I forgot to mention...i will be about 85-90% on road,with the occasional trail ride on a camping trip etc...i am not a hard core off-road guy....yet.....my purchase for the new gears is simply to get out of peoples way lol....its a turd right now...and hopefully a little better fuel mileage.....
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Old 03-11-2011, 04:39 PM   #10
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You'll be fine. Like I said before, 5.13 on an automatic JK with 35's is widely accepted as "optimum"

Just be easy. That's a big tire for little gears.
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Old 03-11-2011, 05:32 PM   #11
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Dean, if you had said you did 90% offroad you would probably be fine with the stock gears. Just put it in low range, and you're good. With 90% onroad, the regearing will be a big help though. The more time you spend on road, the more you will benefit from regearing.

Look at it this way. With 3.73 gears, an auto trans, and 35" tires, you are probably turning about 1900 RPM at 75 mph. Well guess what, these 3.8 engines produce all of 60 hp at 1900 RPM. That means you only have 60 hp to keep you moving down the interstate. All it takes is a slight headwind, or the very slightest of uphill grades (like a freeway overpass), and you're Jeep has to downshift to third gear. By changing to 5.13 gears you're engine will be turning 2600 RPM at 75 mph. These 3.8 engines produce 92 hp at 2600 RPM, which means you'll be seeing a 50% increase in power at highway speeds with the new gears. I'm betting you'll be able to notice a difference.
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Old 03-13-2011, 09:33 AM   #12
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5:13 is GREAT on a JK With Auto trans...... I run 5:13's with 35s and it performs great on and off road..

and what MOPWR2U is correct and on point with his supplied information..
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Old 03-13-2011, 09:49 AM   #13
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I'd sleeve and gusset the front axle too.

5.13s are fine unless you're a flatlander; then you might even like the 4.88s with a Flashpaq. But if it's hilly where you live, stick with the 5.13.

Don't get all huffy, buildembig. Unless you've lived with a JK, you wouldn't understand. Really. It doesn't/won't perform like anything else on paper. You can't base opinions upon previous conventional wisdom.
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Old 03-13-2011, 12:05 PM   #14
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I'd sleeve and gusset the front axle too.

5.13s are fine unless you're a flatlander; then you might even like the 4.88s with a Flashpaq. But if it's hilly where you live, stick with the 5.13.

Don't get all huffy, buildembig. Unless you've lived with a JK, you wouldn't understand. Really. It doesn't/won't perform like anything else on paper. You can't base opinions upon previous conventional wisdom.
You really have no need to sleeve it unless you plan on putting a locker in it. I would recommend gussets though, im running 35s on my 30 and I can already see some stress on my Cs.
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Old 03-13-2011, 12:17 PM   #15
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Originally Posted by ncossey

You really have no need to sleeve it unless you plan on putting a locker in it. I would recommend gussets though, im running 35s on my 30 and I can already see some stress on my Cs.
x2

My C's look good but there are numerous issues with folks bending them. I'm flirting with the idea of C gussets myself.

Need some shafts too. I keep blowing u-joints. Matter of time I think till I bomb the shaft
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Old 03-13-2011, 01:23 PM   #16
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EVO C-gussets are a cheap easy up grade if you know what your doing, you may as well do lower control arm skids at the same time..
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Old 03-13-2011, 03:16 PM   #17
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Don't over think it Dean! Take some breaths, have your favorite beverage and be confident in knowing that you will love the performance and the fact you have your ride back where you enjoy driving it again.

Allen

If you need anything else, just give me a call.

Namaste,

Allen

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