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Old 03-13-2012, 02:08 PM   #31
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Originally Posted by rics1997
The JK is a bigger and heavier brick then the older models. That said, the 3.6 is a lot better engine in the sense of hp. Reliability will have to see. The 3.8 can even be a great engine if you regear it to a better gear.

I think it is weird that the 3.8 models had 3.21 standard for manuals and 3.73 for auto yet the increased hp 3.6 has the auto at 3.21 and the manual at 3.73 standard. They make no sense in their logic
I dont think 3:21 should even be in any wrangler. Just saying

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Old 03-13-2012, 02:17 PM   #32
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Old 03-13-2012, 11:11 PM   #33
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Hey. Have 2012 Sport with 3.6 and 3.73 rear, 6 spd. 17" rims, 31" wheels. I really enjoy the 3.6. You can really wind it up. The 3.6 is Chryslers workhorse now so it'll be around awhile I guess. Bought the lifetime warrantee pack so I'll play and they can pay. I will skin the bottom though to protect my investment best I can.
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Old 03-14-2012, 12:26 AM   #34
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figure a TJ sport with a manual is about 3500 lbs, 190 hp = 18.4 lbs per hp.

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At least 4100 for the JKU, 285 hp = 14.4 lbs per hp.

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I guess I can see how a 4 door '12 with an auto and an engine that hasn't broken in wouldn't seem like a big improvement over a manual, 6 cyl TJ. Still though, I think the difference would be pretty apparent if you ran them side by side. And the Pentastar really does wake up at about 300 miles, a noticeable power improvement.

Basically I think (1) the weight, (2) the auto, (3) the Pentastar not being broken in, and possibly (4) the gearing may account for the OP's experience. Drive a TJ and a JK in a similar configuration and let us know what you think.
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Old 03-14-2012, 02:17 AM   #35
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Anymore namecalling and the thread is done and I will be PMing the namecallers.
I'm really confused about this threat after reading this thread. Where was the name-calling?

I might be missing something, but it just reads like a thread about the 3.6L Pentastar. Some people respectfully disagree with each other, but do we all have to agree on everything to have an acceptable forum? Who called who a "name" other than his username?
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Old 03-14-2012, 03:16 AM   #36
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I'm really confused about this threat after reading this thread. Where was the name-calling?

I might be missing something, but it just reads like a thread about the 3.6L Pentastar. Some people respectfully disagree with each other, but do we all have to agree on everything to have an acceptable forum? Who called who a "name" other than his username?
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Old 03-14-2012, 09:41 AM   #37
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Oh, thanks, makes sense.

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Old 11-07-2013, 03:09 PM   #38
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With MPG's these days... I believe they quote the 3.6 at 17-21 the 3.8 at 15-19 and the 4.0 at 15-19

Some people will think that's worth it.
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Old 11-07-2013, 04:31 PM   #39
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With MPG's these days... I believe they quote the 3.6 at 17-21 the 3.8 at 15-19 and the 4.0 at 15-19

Some people will think that's worth it.
All of these are rated on the models that get the best mpg too. That's the 3.21 rear end and the 29"Steelies. The larger the tires and the steeper the gearing, you may not be able to achieve these
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Old 11-07-2013, 07:29 PM   #40
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You probably forgot to release the Emergency Brake on the JK!
No big deal, it's just a honest mistake.......... Just kidding!

Now for my experience. I had a 2003 TJ 4.0 auto, with 3:73. It performed quiet well in town, but in the mountains of Arizona, not so good.

I now own a 2013 JKR, auto, 4:10. Yes in town the performance is somewhat similar.
But in the mountains, there is night and day difference. The 3.6 keeps up with the best of them on the mountain grades. But my 4.0 was nothing to brag about in the mountainous terrain.

SO THE BOTTOM LINE IS, THAT IT MAKES A DIFFERENCE AS TO WHERE YOU DRIVE......
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Old 11-07-2013, 09:23 PM   #41
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I dont think 3:21 should even be in any wrangler. Just saying
I thought the same thing ,but what about retired people who pull them behind motorhomes. They are only wanting a stock convertible that tows easy behind motorhomes.
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Old 11-07-2013, 09:29 PM   #42
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OP the only way to really appreciate the 3.6 is to drive a 3.8 particularly with 32-33" tires and stock gear ratio.

The 3.6 may not be a great engine in the general scheme of things but compared to the 3.8 it is a big step in the right direction.
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Old 11-07-2013, 10:51 PM   #43
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OP the only way to really appreciate the 3.6 is to drive a 3.8 particularly with 32-33" tires and stock gear ratio. The 3.6 may not be a great engine in the general scheme of things but compared to the 3.8 it is a big step in the right direction.
This is a very true statement, my 13 with 33's and 3.73 gears would blow the doors off my 08 with 33's and 4.10's.
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Old 11-08-2013, 08:40 AM   #44
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Before the JK I had an '11 Compass with the old 'world' engine. It felt like a sports car compared to the JK with the pentastar. So I can only imagine how bogged down the previous wranglers must feel. The 3.6 isn't a feature imo, it's a flat out necessity.
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Old 11-08-2013, 04:04 PM   #45
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Anyone figured out how to swap a 4.0 into the JK?

No defective heads, no hydraulic lifter bleed down, no [insert other Pentastar issues]. Must be nice
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Old 11-08-2013, 04:33 PM   #46
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Anyone figured out how to swap a 4.0 into the JK?

No defective heads, no hydraulic lifter bleed down, no [insert other Pentastar issues]. Must be nice
Sorry, too busy enjoying the 285 horsepower, good gas mileage, and 90k miles left on the warranty
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Old 11-08-2013, 09:14 PM   #47
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Sorry, too busy enjoying the 285 horsepower, good gas mileage, and 90k miles left on the warranty
Ah...285hp, yes, it's definitely enough to just barely get the brick out of the way of NYC traffic....most of the time. I'm glad at least someone is getting good mileage, though...if I baby it enough I might crack 16mpg...if there's a tailwind of course

Warranty...is that the thing where you get to bring the Jeep in for one problem and get it back with several new fun problems, courtesy of the diligent, hard working chrysler techs? Is that the option where you bring it in for one thing and next thing you know you're a regular customer at the chrysler shop? Mmmm...that does sound like fun, heck I got nothing better to do with my life anyway

p.s. i <3 my jeep
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Old 11-08-2013, 09:34 PM   #48
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Love the 3.6 engine but i have some grumbles about it. You really cant beat the inline 6 in terms of reliability. With the pentastar reliability has really yet to be seen as its still very new. My first grumble is this engines great displeasure it gives me down low in the rpm range. Could be bc of my 3:21's and 32's but still, not to big on low end torque. Secondly, it (no matter what people say) is pushing a high compression motor, Which naturally be a little more finicky. I put 89 in mine personally. other than that mine uses no oil (knock on wood) and runs like a top. When the cams swap it does put out a nice exhaust note through my banks muffler too gotta love dohc.


Edit: p.s btw i swear i saw a 4.0 crate motor somewhere that had more hp and torque than the 3.6 (just saying)
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Old 11-08-2013, 10:02 PM   #49
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Anyone figured out how to swap a 4.0 into the JK?

No defective heads, no hydraulic lifter bleed down, no [insert other Pentastar issues]. Must be nice
Seriously? With that mindset, you might as well just go get a horse.
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Old 11-08-2013, 10:39 PM   #50
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First JK Wrangler I've ever owned and I'm very satisfied with it. Although I do notice a lot of people filing complaints about them cause of all the hate towards them that they end up looking for issues themselves. I'm not comparing my Jeep to anyone's but I don't have anything bad to say about it.
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Old 11-09-2013, 12:31 AM   #51
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I bought the 14 JKUS and have less than 900 miles on it so far and was averaging 21.9 mpg the other day on the interstate at 65 mph. Not a DD but was pretty impressed that it was getting over 20. It has auto and 3.21 gearing and I plan on a 2.5" lift and 33's so I doubt the over 20 mg will last for long.
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Old 11-09-2013, 04:35 AM   #52
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Seriously? With that mindset, you might as well just go get a horse.
If by horse you mean toyota, honda, or nissan....

Nah, I'm just kidding of course (my previous post was a joke). I love my JK. But I'm still a realist...just because I live here and own one, I'm not gonna deny that, for the most part, American cars are light years behind foreign cars.
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Old 11-09-2013, 06:41 AM   #53
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I now have both. A 2009 and a 2014. They both have manual transmissions and 3.73 gearing. When first brought home the 2014 felt very new and the interior much more "plush." It was smoother and quieter. (the 09 has an aftermarket exhaust). I didn't notice any huge difference in engine performance. Any difference was really masked by the "newness."

The 14 now has the same suspension as the 09, but with larger tires (34's). There is absolutely no major difference in engine performance between the two. Nothing about the 14 makes me feel like my 09 is any less.

The biggest advantage that I see to the 14 is the soft top. The new larger windows (introduced in 11) gives you a much better view and eliminates some of the blind spot.

The biggest disadvantage is the elimination of the open handle on the inside of the door. This takes away the "reach through the window" method of removing and carrying the doors.

In the take it or leave it department, I really don't need to be able to see my feet or the inside of my cup holder.

The one thing I would want on my 09 that the 14 has is the word "Jeep" lights up in the dash when you turn the engine on.
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Old 11-09-2013, 07:07 AM   #54
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Anyone figured out how to swap a 4.0 into the JK?

No defective heads, no hydraulic lifter bleed down, no [insert other Pentastar issues]. Must be nice
Yep, with the 4.0 we just had to put up with cracked heads on some late models, bad coil packs, leaky main seals, leaky valve covers, poor gas mileage, and other non-Pentastar issues. Don't get me wrong, I've had 3 Jeeps with the 4.0 and overall they are great, long-lasting engines... but not automotive perfection by any means.
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Old 11-09-2013, 01:37 PM   #55
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I now have both. A 2009 and a 2014. They both have manual transmissions and 3.73 gearing. When first brought home the 2014 felt very new and the interior much more "plush." It was smoother and quieter. (the 09 has an aftermarket exhaust). I didn't notice any huge difference in engine performance. Any difference was really masked by the "newness."

The 14 now has the same suspension as the 09, but with larger tires (34's). There is absolutely no major difference in engine performance between the two.
Opinions are funny. I drove 11 and 12 jkr sticks back back to back and was shocked at how much faster the 12 was. I was anticipating a big difference and was still floored at how much more power the 12 had.


Because the peak torque is about the same, both will have roughly the same peak acceleration in first. But the 3.8 just gives up and the 3.6 keeps steppin'.
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Old 11-09-2013, 05:08 PM   #56
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Opinions are funny. I drove 11 and 12 jkr sticks back back to back and was shocked at how much faster the 12 was. I was anticipating a big difference and was still floored at how much more power the 12 had. Because the peak torque is about the same, both will have roughly the same peak acceleration in first. But the 3.8 just gives up and the 3.6 keeps steppin'.
A lot of the difference can be attributed to the poor factory tuning and throttle lag which is well noted in the 3.8. That being said, there can also be differences between same engines in the same model year. We have an 07,08, and 09 and the 09 always felt like it had a little more jam. Until the 07and 08 received tuners. The 07 has 4.10 gears the other 2 have 3.73. I test drove a few 2012-13 with the 3.6 and found very little difference motor wise from the 3.8, gearing wise for the A/T is another story.
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Old 11-09-2013, 05:14 PM   #57
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I only have 3200 miles, on my 2012 JK; but, I'm very pleased with the 3.6L and auto trans.
Of course, I may have something wrong with me. This is my 7th Wrangler and I've always felt the engines perform very well for their purpose.
I never bought a Wrangler and expected a Corvette.
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Old 11-09-2013, 06:15 PM   #58
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A lot of the difference can be attributed to the poor factory tuning and throttle lag which is well noted in the 3.8. That being said, there can also be differences between same engines in the same model year. We have an 07,08, and 09 and the 09 always felt like it had a little more jam. Until the 07and 08 received tuners. The 07 has 4.10 gears the other 2 have 3.73. I test drove a few 2012-13 with the 3.6 and found very little difference motor wise from the 3.8, gearing wise for the A/T is another story.
Meh. It's the 40% more power that matters to me.
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Old 11-09-2013, 08:32 PM   #59
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Opinions are funny. I drove 11 and 12 jkr sticks back back to back and was shocked at how much faster the 12 was. I was anticipating a big difference and was still floored at how much more power the 12 had.


Because the peak torque is about the same, both will have roughly the same peak acceleration in first. But the 3.8 just gives up and the 3.6 keeps steppin'.
Were they geared the same? My two JK's are basically the same other than engine and interior.
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Old 11-09-2013, 11:40 PM   #60
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Were they geared the same? My two JK's are basically the same other than engine and interior.
yeah rubi sticks are all 4.10's right? i think the 3.6 sneaks up on people. the butt dyno doesn't feel a difference in peak acceleration, but if you look at the speedometer after a few seconds you are actually going pretty fast.

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