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Unread 03-05-2013, 11:45 AM   #1
supbuckeye
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Should I be worried of this answer by Jeep shop?

Ok i want to first say, its my first post here as Im looking into a few JK Wranglers. Would be my first Jeep (coming from a LR3) Ive researched a few things on this site the last few days but here my dilemma.

It is my understanding after reading several threads here...that a JK Wrangler X with automatic, upgraded 35" tires running the 3.73 stock gearing would not be pleasurable considering my driving is 75% highway. And according to several of you, the 5.13 is the way to go including the chart I found with yellow, green & blue.

If this is correct...should I be concerned when speaking to a local Jeep specialized shop that is selling this JK (auto, 4" lift, 35" tires, stock 3.73) that Im considering and he is telling me, there is no way that 5.13 gears would work bc you would be running @ 6k rpm and the stock 3.73 gears are fine considering the JK came stock with 32" tires. And that I wont notice any difference in performance wise btwn the switch??? Now...I have no problem getting it regeared if i buy it and its needed but is he just blowing me smoke or should I be concerned? This being the shop that I would take it to for all it upgrades.

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Unread 03-05-2013, 11:47 AM   #2
tjkj2002
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Time to find a place that knows what they are actually talking about.Granted in FL it's pretty darn flat but 5.13's would be the way to go with the 3.8 and 42RLE trying to turn 35" tires.
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Unread 03-05-2013, 12:43 PM   #3
roughandtangle
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It all depends on what you want to do with the Jeep. If you want to do serious offroading with 35" tires and all you are going to do is re-gear... You might want to do some more research... If all you want is a lifted Jeep to drive on the road then the 3.73's will get you by... Although looking around for a good Rubicon with 4.10's would do you better.
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Unread 03-05-2013, 12:53 PM   #4
ncb
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5.13 gears won't cruise at 6K RPM with that setup. Look at the chart.
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Unread 03-05-2013, 01:01 PM   #5
Demp
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Time to get my math on!

6000RPM, I'm assuming the top gear in a 13's automatic (0.86) with 5.13 gears and 35" tires.

You'd be going something around 146mph.......
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Unread 03-05-2013, 01:02 PM   #6
supbuckeye
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Well...i would like to start doing some more offroading but it will also be my DD where the speed limit is 70mph. i put 30-35k miles on my current SUV that has 33.5" tires every yr driving for work. Anyway I look it, maintaining a jeep will undoubtably be cheaper than my current setup.

So once I find the proper jeep in my price range I will add whatever I need to be adequate for both offroading & DD not just gearing.
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Unread 03-05-2013, 01:07 PM   #7
jstrubberg
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My X with 5.13 gears and 35" Mickey Thompsons runs 2450 rpm @ 65 mph and 2600 rpm @ 70mph.

As usual, the salesman has no idea what he is talking about.

You will not like those gears with those tires, I guarantee it.
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Unread 03-05-2013, 01:10 PM   #8
amick218
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Sub'd.
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Unread 03-05-2013, 01:10 PM   #9
amick218
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Quote:
Originally Posted by jstrubberg View Post
My X with 5.13 gears and 35" Mickey Thompsons runs 2450 rpm @ 65 mph and 2600 rpm @ 70mph.

As usual, the salesman has no idea what he is talking about.

You will not like those gears with those tires, I guarantee it.
Damn, does that kill mpg? Lol
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Unread 03-05-2013, 01:29 PM   #10
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What year jeep is it? Anything 2012+ with the 3.6 and their accompanying transmissions is a whole different ball game.

I run 37s with 4.11s and the 6 speed on my '12 and I'm pretty happy

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Unread 03-05-2013, 02:13 PM   #11
supbuckeye
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Unread 03-05-2013, 02:29 PM   #12
HighandLow
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Quote:
Originally Posted by Demp View Post
Time to get my math on!

6000RPM, I'm assuming the top gear in a 13's automatic (0.86) with 5.13 gears and 35" tires.

You'd be going something around 146mph.......

I needed a good laugh today!

Print the chart out and show it to your jeep shop.
jk_ratio-chart.jpg  
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Unread 03-05-2013, 03:07 PM   #13
1222
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to the forum.

Just take the Jeep for a test drive, preferably on the highway with an incline and see how you like it. Driving around in the city with those gears probably will be satisfactory so you wouldn’t be too disappointed there.

Like mentioned above they are lying through their teeth about the rpms. Also, and very important, pay close attention to how the Jeep handles on the road/freeway. A four (4) inch lift needs to be done properly to handle well and just because a shop installed it does not mean they did it right; dealers screw them up all the time.

And yes, 5.13s is the most popular gear of choice for the 3.8 and auto (2007-2011) JKs. I also ran 5.13s and 35s with my ’08.
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Unread 03-05-2013, 04:20 PM   #14
Remmy18
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Quote:
Originally Posted by supbuckeye
Ok i want to first say, its my first post here as Im looking into a few JK Wranglers. Would be my first Jeep (coming from a LR3) Ive researched a few things on this site the last few days but here my dilemma.

It is my understanding after reading several threads here...that a JK Wrangler X with automatic, upgraded 35" tires running the 3.73 stock gearing would not be pleasurable considering my driving is 75% highway. And according to several of you, the 5.13 is the way to go including the chart I found with yellow, green & blue.

If this is correct...should I be concerned when speaking to a local Jeep specialized shop that is selling this JK (auto, 4" lift, 35" tires, stock 3.73) that Im considering and he is telling me, there is no way that 5.13 gears would work bc you would be running @ 6k rpm and the stock 3.73 gears are fine considering the JK came stock with 32" tires. And that I wont notice any difference in performance wise btwn the switch??? Now...I have no problem getting it regeared if i buy it and its needed but is he just blowing me smoke or should I be concerned? This being the shop that I would take it to for all it upgrades.
I'd be concerned about buying a Jeep with 4" lift installed. That's a lot of lift and really needs to be done properly. If it has cheapo springs, it'll ride so rough you'll lose your fillings in your teeth.
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Unread 03-05-2013, 04:29 PM   #15
supbuckeye
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Quote:
Originally Posted by Remmy18

I'd be concerned about buying a Jeep with 4" lift installed. That's a lot of lift and really needs to be done properly. If it has cheapo springs, it'll ride so rough you'll lose your fillings in your teeth.
I will note that about the lift, my current vehicle sits pretty high but its center of gravity is much lower and weighs twice as much almost. i will continue to do my research. i typically over analyze things at time and def seems that I have reached out to a knowledgable group.

It still just doesnt sit well with me that these guys who claim to only specialize in jeeps 3 times during my conversation with him told me I was misinformed about the 5.13 gears. I even asked him...are we talking about the same jeep? Its an auto right?
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