Who knows or, where can I find the major differences between a '12JK and a '16? - Jeep Wrangler Forum
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Old 07-21-2016, 09:28 PM
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Who knows or, where can I find the major differences between a '12JK and a '16?

Gents,
We've been TJ fans for years now and, based lots of circumstances, we've recently sold our '03 Red Rubi and, will be diving into the "JK" world. We will more than likely be purchasing a JKU, (Unlimited) Rubicon. We've had two TJ Rubicons and, even though the actual "Wheeling" will be stepped down from our many years at Moab, Colorado, Arizona and Southern CA, we will still be hitting the trails every now and then. And since we've got extensive experience with the Rubicons capabilities, even a bone stock one, this is why we'll be looking for a nice used one, in the JK version.

Now, to my question. The '07 -- '11 JKs had/have that junk 3.8L engine that supposedly has very little power and eats fuel like it's free. And, the '12s and up have the newer 3.6L that's got a ton more HP and, gets better fuel mileage.

So, this means we'd be looking for a '12 and newer. Now, since the advent of the 3.8L in 2012, what or, maybe I should ask "How many" changes have taken place, in the drive train/engine/brakes/body/interior/ etc. since the 2012 model year? In other words, is the 3.8L in a `2016 model, the same EXACT engine, that's in the 2012 model?

Is the transmission the same, are there any changes to the 241OR Rock Track transfer case or, is the same T-case that's been used for how many years?

What we're looking for is, a list of changes made over the years, from 2012 to 2016 to help us with making our decision on which year to purchase. It's highly unlikely that we'll be buying new. This is one of those things that, if we find a really nice '12 JKU Rubi for sale and, it's one of the three colors that we really like, we won't mind driving to another state to pick it up, maybe two or three states. Been there done that, way more than once.

But if, there were major engine improvements in say, the 2013, '14 and up models (due to glitches not known in a first production year engine), should we stay away from a '12 and look only at newer models? Anyway, if there's a website or person that I can be directed to, to find out what changes, if any, have been made since '12, I'd surely be appreciative.
Scott

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Old 07-21-2016, 09:37 PM   #2
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only minor interior tweeks ie nicer seats and better stereo speakers/sub etc, the tranny t/c etc are all the same. some say the 12 and early 13 had more cylinder head issues but not sure that really every came to bear. regardless they have a 150,000 warrant and 10 years on the heads and replacing cylinder heads is no big deal nothing to scare you way that is for sure.

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Old 07-21-2016, 10:12 PM   #3
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The biggest change for 12 is the auto if that's the one you get. While not perfect it's a large step above previous autos in the wrangler. The drive train is the same in the 12-16 years. 15-16 have a better premium audio versus 12-14.

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Old 07-23-2016, 08:55 AM   #4
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Differences I've found between 2012 and 2015:

-TPMS sensors are different frequency. 2015 shows PSI for each tire, 2012 only has idiot light
-Connectivity display in dash is better resolution than the 2012
-Alpine audio is far superior to the 2012 premium
-Engine is an updated version of the 3.6. Even the oil filter is different
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Old 07-23-2016, 12:55 PM   #5
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2012's all had the defective "AA" cylinder head and will need replacement. I had three of them, all traded in for newer models.
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Old 07-24-2016, 04:33 PM
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2012's all had the defective "AA" cylinder head and will need replacement. I had three of them, all traded in for newer models.
Are you saying that EVERY SINGLE 2012 JK that came off the line with the 3.6L Pentastar had DEFECTIVE HEADS? And, are you saying you had THREE 2012 JKs and you traded all three 2012 JKs on newer models?

Wow,, I'm newer to the JK environment so, if this is true, I might just stay away from a '12. There's one in CO that I'm looking at that's only got 12K miles on it, for a 2012, that's incredibly low mileage. It's two states away from us and, the model and color that we like. But, I'm not really interested in buying a Jeep then, turning around and having major engine work done right off the bat.
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Old 07-24-2016, 05:17 PM   #7
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Quote:
Originally Posted by FIRE UP View Post
Are you saying that EVERY SINGLE 2012 JK that came off the line with the 3.6L Pentastar had DEFECTIVE HEADS? And, are you saying you had THREE 2012 JKs and you traded all three 2012 JKs on newer models?

Wow,, I'm newer to the JK environment so, if this is true, I might just stay away from a '12. There's one in CO that I'm looking at that's only got 12K miles on it, for a 2012, that's incredibly low mileage. It's two states away from us and, the model and color that we like. But, I'm not really interested in buying a Jeep then, turning around and having major engine work done right off the bat.
Scott
I do not believe that is true there are many high mile early pentastars that have never had an issue. Sounds like if a person had 3 12's go bad just really bad luck. It is an easy repair and Chrysler is giving 10 years 150,000 warranty on the heads.
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Old 07-24-2016, 07:13 PM   #8
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The AA heads were an engineering error not a vendor supplier batch of defective heads. It wasn't until July 2012 that they revised the design. So all 2012's are effected and a few early 2013's. Left cylinder head which had extreme heat build up. Some go 10K miles others go 70K miles. Yes they are covered under an extended warranty for the problem, but who wants a new Jeep torn apart by some dealer mechanic working on some standard time. There is a LONG post on this subject.

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