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Old June 25th, 2013, 07:23 AM   #1
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Default another JK question, sand dunes related

for those of you driving relatively stock JK's on the sand dunes

how do they do?

1) what year do you have?

2) is it a rubi or not?

3) are you using low or high range climbing hills?

My reason for asking is this, I'm looking to buy one, and I'm in the air on buying new or used, and rubi or not.

Looking at prices of new to a couple years old, looks like I'd get a brand new Rubi for close to the same price as a couple year old used one.

My problem with that is this: the TJ rubi did not do as well as a non rubi in the sand, high range wasn't always enough to climb hills, and low range was too low.

Is the new motor (introduced in 2012) enough to power the JK up all the hills, even on the super soft sand days, in high range?

If not then I would guess going into low is too low unless putting bigger tires on, which I don't plan to do for a long time.
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Old June 25th, 2013, 07:27 AM   #2
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Anyone who said a rubi tj was not as good as a regular tj in high range os a fucking retard. 4hi is the same on both... And that same retard would have problems with a stock tj at the dunes.
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Old June 25th, 2013, 07:37 AM   #3
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Anyone who said a rubi tj was not as good as a regular tj in high range os a fucking retard. 4hi is the same on both... And that same retard would have problems with a stock tj at the dunes.
I think what hes saying is the tj in general wont climb good in 4hi and the lower gear ratio in the rubi is to low fpr the dunes

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Old June 25th, 2013, 07:39 AM   #4
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Anyone who said a rubi tj was not as good as a regular tj in high range os a fucking retard. 4hi is the same on both... And that same retard would have problems with a stock tj at the dunes.
Pretty sure you're reading that wrong and are in fact the only retard in question. He didn't say high range is different, he just said it isn't enough for all the hills, and that low range, which is different, is often too low in the Rubi's. I've driven lots of different vehicles in the dunes and his logic makes sense.


To the OP, sorry, I have no experience with JKs in the dunes.
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Old June 25th, 2013, 07:43 AM   #5
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John, I never had an issue with the Rubi on the dunes. Neither did Romey.
Well, I did have a problem one time when that idiot Kelly aired up my rear tires and I did not know.

What a dick.
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Old June 25th, 2013, 07:44 AM   #6
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My wife's bone stock 2008 Unlimited "X" was fine at the dunes - disable traction control, 12psi all around, mash the gas and go (ours was an auto). Even with the anemic 3.8L minivan engine it worked just fine, although you need to get used to the longer wheel base and lower stance. 4Lo helped keep the revs up, which would not be as useful in a rubicon, 4:1 is overkill for the dunes, but it ran OK in 4Hi too.
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Old June 25th, 2013, 07:45 AM   #7
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John, I never had an issue with the Rubi on the dunes. Neither did Romey.
Well, I did have a problem one time when that idiot Kelly aired up my rear tires and I did not know.

What a dick.
I was surprised to see Swampjeep said he struggled in a ruby. I was going to say that yours did good, but you were rolling bigger tires that may have allowed you to run in low.

The only time you ever got stuck was due to driver error, and there was a lot of that.
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Old June 25th, 2013, 07:55 AM   #8
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never had my JK on the dunes but if buying new is an option i wouldn't hesitate to go that route. more hp and the 3.8 definitely has some mechanical issues
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Old June 25th, 2013, 08:02 AM   #9
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Originally Posted by clarkstoncracker View Post
I was surprised to see Swampjeep said he struggled in a ruby. I was going to say that yours did good, but you were rolling bigger tires that may have allowed you to run in low.

The only time you ever got stuck was due to driver error, and there was a lot of that.
I never drove a rubi out there, I was going off info from others, I thought Romey said he had a few issues when he was running 33's, but only when the sand was extra soft.
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Old June 25th, 2013, 08:04 AM   #10
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Besides the engine change in 2012, the automatic transmission changed as well. This can make a big difference which range you are running.

2007-11 autos were the old Dodge 42RE, with a 2.84 first, the 12+ use a 3.59 first gear in the 5 speed. Older Jeep 3 speed 32REs were a 2.74 first gear.

So, say a rubicon with 4.10 gears, and the 3.59 first gear, that is the same gearing as a 09 JK with 5.18 gears, or a 3 speed TJ with 5.38 gears, when considering first gear engine speeds. Also remember, compared to earlier motors, the 3.6 has a 6500 rpm redline, so you can hold that gear longer up the hill.

We have the 3.6/5 speed auto in our 12 Durango... its a little soft in the low rpms for such a big vehicle, but shines on higher rpm range, would probably do pretty good in the dunes.

In my F150, we don't use low range. My first gear is 4.17, and axles are 3.55s with 32" tires. Works just about perfect for climbing test hill. We get up to redline but don't shift, and have never had any issues climbing anything there. Its a V8, but also 6500lbs loaded with all the family and gear.

So, thats 4.17 x 3.55 = 14.8 total gearing, with 32s, and 310 hp
The 2012+ JK Rubi = 3.59 x 4.10 = 14.7 total gearing with 31s, so about identical, with about 280hp, and 1000 lbs less weight.


Just providing the nerd perspective..
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Old June 25th, 2013, 08:17 AM   #11
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you guys are giving me a pretty good feeling about going with a 2013 Rubi...

I guess I better go price it out at the dealer, but online I see a Rubi for the same as the Sahara I priced out... add my discount and I should be pretty good.
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Old June 25th, 2013, 08:18 AM   #12
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Originally Posted by swampjeep View Post
you guys are giving me a pretty good feeling about going with a 2013 Rubi...

I guess I better go price it out at the dealer, but online I see a Rubi for the same as the Sahara I priced out... add my discount and I should be pretty good.
Just wish they could tow a tiny bit more than the 3500lbs they are rated for... I've been thinking about getting one myself.. I wonder when the Diesel versions will hit the streets..
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Old June 25th, 2013, 08:42 AM   #13
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I have a 2011 JKU Rubi, the last year of the 3.8 minivan engine and old Auto tranny. I knew that the 4.0:1 low range was too low for the dunes, but would work great at R&V etc. So I put in a RubiCrawler from the start, this gave me the choice of 2.72:1 low range for sand. I run 37" tall tires with the stock 4:10 axle gearing, perfect for the 3.8 to stay in the higher RPM range where it makes a little bit of torque.

Personnally, if/when I buy another I'd get a new one with the Pentastar and 5-speed instead. Unless they ever come out with a diesel in a Wrangler. Because even with the stock tires it cannot hold OD at 70mph unless going downhill, too tall of a ratio for the engine.
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Old June 25th, 2013, 08:46 AM   #14
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Quote:
Originally Posted by bbaXJ View Post
Pretty sure you're reading that wrong and are in fact the only retard in question. He didn't say high range is different, he just said it isn't enough for all the hills, and that low range, which is different, is often too low in the Rubi's. I've driven lots of different vehicles in the dunes and his logic makes sense.


To the OP, sorry, I have no experience with JKs in the dunes.
ya, i totally misread that, im the rtard....
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Old June 25th, 2013, 09:24 AM   #15
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If 1st gear low is too low, why not start in 2nd, or 3rd, or 4th? Or just buy an old lincoln town car for the dunes. Those seem to do just fine...

https://www.youtube.com/watch?v=jRQ7Qb4weU4
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Old June 25th, 2013, 09:30 AM   #16
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If 1st gear low is too low, why not start in 2nd, or 3rd, or 4th? Or just buy an old lincoln town car for the dunes. Those seem to do just fine...

https://www.youtube.com/watch?v=jRQ7Qb4weU4
auto trans...

and I don't care for Lincolns
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Old June 25th, 2013, 09:31 AM   #17
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If 1st gear low is too low, why not start in 2nd, or 3rd, or 4th?
Well, Can you do that in an Auto? (I am certain he wants an automatic).... 2013 gain Autostick, but Chrysler web site says autostick doesn't work in low range...
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Old June 25th, 2013, 09:33 AM   #18
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Originally Posted by swampjeep View Post
auto trans...

and I don't care for Lincolns
How about a honda civic?

https://www.youtube.com/watch?v=q7ZzqBPz4sY

Or a subaru

https://www.youtube.com/watch?v=Sy33zu5w79I
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Last edited by dreezy; June 25th, 2013 at 09:37 AM.
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Old June 25th, 2013, 11:03 AM   #19
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It's the dunes, the noise pedal goes all the way to the floor.

Last edited by Ebs; June 25th, 2013 at 01:46 PM.
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Old June 25th, 2013, 01:14 PM   #20
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have not been to the dunes with my 12 jkur yet, but have gone a couple other places. 4 lo seems to be too low for most situations i have been in with stock rubber. the new drivetrain combined with the 4.10 gearing has plenty of power for me so far in 4 hi.
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